<SEC-DOCUMENT>0001193125-16-671948.txt : 20160804
<SEC-HEADER>0001193125-16-671948.hdr.sgml : 20160804
<ACCEPTANCE-DATETIME>20160804164734
ACCESSION NUMBER:		0001193125-16-671948
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20160804
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20160804
DATE AS OF CHANGE:		20160804

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MPLX LP
		CENTRAL INDEX KEY:			0001552000
		STANDARD INDUSTRIAL CLASSIFICATION:	PIPE LINES (NO NATURAL GAS) [4610]
		IRS NUMBER:				270005456
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35714
		FILM NUMBER:		161808131

	BUSINESS ADDRESS:	
		STREET 1:		200 E. HARDIN STREET
		CITY:			FINDLAY
		STATE:			OH
		ZIP:			45840
		BUSINESS PHONE:		(419) 421-2159

	MAIL ADDRESS:	
		STREET 1:		200 E. HARDIN STREET
		CITY:			FINDLAY
		STATE:			OH
		ZIP:			45840
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>d235314d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<HTML><HEAD>
<TITLE>Form 8-K</TITLE>
</HEAD>
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 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Washington, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM 8-K
</B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Pursuant
to Section&nbsp;13 or 15(d) </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>of the Securities Exchange Act of 1934 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Date of Report (Date of earliest event reported): August 4, 2016 </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>MPLX LP </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact name of
Registrant as specified in its charter) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Delaware</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>001-35714</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>27-0005456</B></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>File Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification Number)</B></P></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>200 E. Hardin Street </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Findlay, Ohio 45840 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Address of principal executive offices, including zip code) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(419)&nbsp;672-6500 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Registrant&#146;s telephone number, including area code) </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the
following provisions: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Written communications pursuant to Rule&nbsp;425 under the Securities Act (17 CFR 230.425) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Soliciting material pursuant to Rule&nbsp;14a-12 under the Exchange Act (17 CFR 240.14a-12) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule&nbsp;14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule&nbsp;13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </TD></TR></TABLE> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">


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<TR>
<TD WIDTH="12%" VALIGN="top" ALIGN="left"><B>Item&nbsp;8.01.</B></TD>
<TD ALIGN="left" VALIGN="top"><B>Other Events. </B></TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Second Amended and Restated Distribution Agreement </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">On August 4, 2016, MPLX LP (the &#147;Partnership&#148;) and MPLX GP LLC, the general partner of the Partnership (the &#147;General Partner&#148;), entered
into a Second Amended and Restated Distribution Agreement (the &#147;Second Amended and Restated Distribution Agreement&#148;), by and among the Partnership, M&amp;R MWE Liberty, LLC (the &#147;Selling Unitholder&#148;) and the General Partner and
each of J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated, Citigroup Global Markets Inc., RBC Capital Markets, LLC, UBS Securities LLC and Wells Fargo Securities, LLC, as agents (collectively, the &#147;Sales
Agents&#148;). The Second Amended and Restated Distribution Agreement amended and restated that certain Amended and Restated Distribution Agreement, dated as of March 4, 2016, to which the Partnership and the General Partner were parties. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Second Amended and Restated Distribution Agreement was entered into to add the Selling Unitholder as a party pursuant to the Registration Rights
Agreement, dated as of December 4, 2015, between the Partnership and Selling Unitholder, which was entered into in connection with the Partnership&#146;s acquisition of MarkWest Energy Partners, L.P., and to increase the number of common units
representing limited partner interests in the Partnership (&#147;Common Units&#148;) available to be issued and sold by the Partnership through the Sales Agents. The Selling Unitholder may, from time to time, sell up to 16,714,547 Common Units and
the Partnership may, from time to time, issue and sell Common Units having an aggregate offering price of up to $1,181,240,389, in each case, pursuant to the terms of the Second Amended and Restated Distribution Agreement.</P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The sales, if any, of Common Units under the Second Amended and Restated Distribution Agreement will be made by any method permitted by law deemed to be an
&#147;at the market offering&#148; as defined in Rule 415 of the Securities Act of 1933, including sales made by means of ordinary brokers&#146; transactions through the New York Stock Exchange, any other national securities exchange or facility
thereof, a trading facility of a national securities association or an alternate trading system, to or through a market maker or directly on or through an electronic communication network or any similar market venue, in each case, at market prices,
in block transactions or as otherwise agreed between us and any Sales Agent.&nbsp;Furthermore, Common Units may be sold to any Sales Agent as principal for its own account at a price agreed upon at the time of the sale. If the Partnership or the
Selling Unitholder sells Common Units to any Sales Agent as principal, the Partnership or Selling Unitholder, as the case may be, will enter into a separate terms agreement with the Sales Agent. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Partnership or the Selling Unitholder, as the case may be, will pay the Sales Agents a commission at a fixed rate of up to 2% of the gross sales price per
Common Unit.&nbsp;In addition, the Partnership has agreed to pay certain of the Sales Agents&#146; and the Selling Unitholder&#146;s expenses incurred in connection with the offering.&nbsp;The Common Units will be sold pursuant to the
Partnership&#146;s shelf registration statements (the &#147;Registration Statements&#148;) on Form S-3 (Registration Nos. 333-203067 and 333-211397) filed on March 27, 2015 and May 16, 2016 with the Securities and Exchange Commission (the
&#147;Commission&#148;). The Company filed a prospectus supplement, dated August 4, 2016, with the Commission in connection with the offer and sale of Common Units to the prospectuses, dated April 15, 2015 and July 19, 2016, and contained in the
Registration Statements. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Second Amended and Restated Distribution Agreement is filed as Exhibit 1.1 to this Current Report on Form 8-K and is
incorporated herein by reference. This description of the material terms of the Second Amended and Restated Distribution Agreement is qualified in its entirety by reference to such exhibit. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Exhibits to Registration Statement </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Partnership is
filing herewith the Second Amended and Restated Distribution Agreement and opinion of Jones Day as exhibits to the Registration Statements. </P> <P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="12%" VALIGN="top" ALIGN="left"><B>Item&nbsp;9.01</B></TD>
<TD ALIGN="left" VALIGN="top"><B>Financial Statements and Exhibits. </B></TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d)&nbsp;Exhibits. </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="92%"></TD></TR>

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<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Exhibit</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1.00pt solid #000000; width:28.45pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Number</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; width:39.50pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Description</B></P></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;1.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Second Amended and Restated Distribution Agreement, dated as of August 4, 2016, by and among the Partnership, the General Partner, the Selling Unitholder and each of J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp;
Smith Incorporated, Citigroup Global Markets Inc., RBC Capital Markets, LLC, UBS Securities LLC and Wells Fargo Securities, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;5.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Opinion of Jones Day</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>23.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Consent of Jones Day (included in Exhibit 5.1)</TD></TR></TABLE>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURES </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the requirements of the Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="44%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="3">MPLX LP</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">MPLX GP LLC, its General Partner</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Date: August 4, 2016</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Nancy K. Buese</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Nancy K. Buese</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Financial&nbsp;Officer</TD></TR>
</TABLE>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Exhibit Index </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


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<TD VALIGN="bottom" WIDTH="5%"></TD>
<TD WIDTH="92%"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Exhibit</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1.00pt solid #000000; width:28.45pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Number</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; width:39.50pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Description</B></P></TD></TR>


<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;1.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Second Amended and Restated Distribution Agreement, dated as of August 4, 2016, by and among the Partnership, the General Partner, the Selling Unitholder and each of J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp;
Smith Incorporated, Citigroup Global Markets Inc., RBC Capital Markets, LLC, UBS Securities LLC and Wells Fargo Securities, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>&nbsp;&nbsp;5.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Opinion of Jones Day</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" NOWRAP>23.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Consent of Jones Day (included in Exhibit 5.1)</TD></TR>
</TABLE>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.1
<SEQUENCE>2
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<DESCRIPTION>EX-1.1
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SECOND AMENDED AND RESTATED DISTRIBUTION AGREEMENT </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">August&nbsp;4, 2016 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">J.P. Morgan Securities LLC
</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">383 Madison Avenue </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY&nbsp;10179 </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">One
Bryant Park </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY&nbsp;10036 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Citigroup Global
Markets Inc. </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">388 Greenwich Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY&nbsp;10013
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">RBC Capital Markets, LLC </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">200 Vesey Street, 8<SUP
STYLE="font-size:85%; vertical-align:top">th</SUP> Floor </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY 10281 </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Wells Fargo Securities, LLC </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">375 Park Avenue, 4th Floor </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY&nbsp;10152 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">UBS Securities LLC </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">1285 Avenue of the Americas </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">New York, NY&nbsp;10019 </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">MPLX LP, a Delaware
limited partnership (the &#147;<B>Partnership</B>&#148;), MPLX GP LLC, a Delaware limited liability company and the sole general partner of the Partnership (the &#147;<B>General Partner</B>&#148;), M&amp;R MWE Liberty, LLC, a Delaware limited
liability company (the &#147;<B>Selling Unitholder</B>&#148;), and each of J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated, Citigroup Global Markets Inc., RBC Capital Markets, LLC, Wells Fargo Securities, LLC and
UBS Securities LLC as agent and/or principal under any Terms Agreement (as defined in Section&nbsp;1(a) below) (each an &#147;<B>Agent</B>&#148; and collectively the &#147;<B>Agents</B>&#148;) hereby confirm their agreement to amend and restate the
Amended and Restated Distribution Agreement, dated March&nbsp;4, 2016 (the &#147;<B>Amended and Restated Distribution Agreement</B>&#148;), entered into among the Partnership, the General Partner and certain of the Agents, on the terms and
conditions described below in this Second Amended and Restated Distribution Agreement (this &#147;<B>Agreement</B>&#148;). </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to
the terms of this Agreement, the Partnership proposes to issue and sell from time to time common units representing limited partner interests in the Partnership (&#147;<B>Common Units</B>&#148;) having an aggregate Gross Sales Price (as defined in
Section&nbsp;2(b) below) of up to $1,181,240,389 (the &#147;<B>Maximum Amount</B>&#148;), excluding for the avoidance of doubt, the Common Units sold by the Partnership prior to the date hereof pursuant to the Amended and Restated Distribution
Agreement and the Distribution Agreement, dated May&nbsp;18, 2015 entered into among the Partnership, the General Partner and certain the Agents, on the terms set forth in Section&nbsp;1 of this Agreement.&nbsp;Such Common Units to be sold by the
Partnership are hereinafter collectively referred to as the &#147;<B>Primary Units</B>&#148; and are described in the Prospectus referred to below. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the terms of this Agreement, the Selling Unitholder proposes to sell from time to time up to 16,714,547&nbsp;Common Units (the
&#147;<B>Secondary Units</B>&#148; and together, with the Primary Units, the &#147;<B>Units</B>&#148;) on the terms set forth in Section&nbsp;1 of this Agreement. For the avoidance of doubt, the maximum number of Secondary Units that may be sold
before July 1, 2017 is 12,364,490 common units (the &#147;<B>Secondary Unit 2017 Limitation</B>&#148;). References </P>
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in this Agreement to the &#147;<B>Selling Party</B>&#148; shall refer to the Partnership with respect to Primary Units and the Selling Unitholder with respect Secondary Units, as applicable.</P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Partnership has filed with the Securities and Exchange Commission (the &#147;<B>Commission</B>&#148;) (i)&nbsp;a registration statement on
<FONT STYLE="white-space:nowrap">Form&nbsp;S-3</FONT> (No.&nbsp;333-203067) (the &#147;<B>Partnership Registration Statement</B>&#148;) for the registration of the Primary Units of the Partnership under the Securities Act of 1933, as amended, and
the rules and regulations of the Commission thereunder (collectively, the &#147;<B>Securities Act</B>&#148;); and such registration statement sets forth the terms of the offering, sale and plan of distribution of the Primary Units and contains
additional information concerning the Partnership and its business and (ii)&nbsp;a registration statement on <FONT STYLE="white-space:nowrap">Form&nbsp;S-3</FONT> <FONT STYLE="white-space:nowrap">(No.&nbsp;333-211397)</FONT> (the &#147;<B>Selling
Unitholder Registration Statement</B>,&#148; and together with the Partnership Registration Statement, the &#147;<B>Registration Statements</B>&#148;).&nbsp;Except where the context otherwise requires, &#147;<B>Registration Statements</B>&#148; as
used herein, means the registration statements, as amended at the time of their effectiveness for purposes of Section&nbsp;11 of the Securities Act, as such section applies to the Agents, including (1)&nbsp;all documents filed as a part thereof and
(2)&nbsp;any information contained in a prospectus filed with the Commission pursuant to Rule&nbsp;424(b) under the Securities Act, to the extent such information is deemed, pursuant to Rule&nbsp;430B or Rule&nbsp;430C under the Securities Act, to
be part of the registration statements at the time of their effectiveness.&nbsp;&#147;<B>Basic Prospectuses</B>&#148; means the prospectus dated April&nbsp;15, 2015 filed as part of the Partnership Registration Statement and the prospectus dated
July&nbsp;19, 2016 filed as part of the Selling Unitholder Registration Statement; &#147;<B>Prospectus Supplement</B>&#148; means the most recent prospectus supplement relating to the Units, filed by the Partnership with the Commission pursuant to
Rule&nbsp;424(b) under the Securities Act on or before the second business day after the date of its first use in connection with a public offering or sale of Units pursuant hereto (or such earlier time as may be required under the Securities Act),
in the form furnished by the Partnership to the Agents in connection with the offering of the Units, together with the Basic Prospectuses; &#147;<B>Prospectus</B>&#148; means the Prospectus Supplement (and any additional prospectus supplement
prepared in accordance with the provision of Section&nbsp;5(g) of this Agreement and filed in accordance with the provisions of Rule&nbsp;424(b)) together with the Basic Prospectuses attached to or used with the Prospectus Supplement; and
&#147;<B>Permitted Free Writing Prospectus</B>&#148; has the meaning set forth in Section&nbsp;3(b).&nbsp;Any reference herein to the Registration Statements, the Basic Prospectuses, the Prospectus Supplement, the Prospectus or any Permitted Free
Writing Prospectus shall, unless otherwise stated, be deemed to refer to and include the documents, if any, incorporated by reference, or deemed to be incorporated by reference, therein as of the date of such document (the &#147;<B>Incorporated
Documents</B>&#148;), including, unless the context otherwise requires, the documents, if any, filed as exhibits to such Incorporated Documents.&nbsp;Any reference herein to the terms &#147;amend,&#148; &#147;amendment&#148; or
&#147;supplement&#148; with respect to the Registration Statements, the Basic Prospectuses, the Prospectus Supplement, the Prospectus or any Permitted Free Writing Prospectus shall, unless stated otherwise, be deemed to refer to and include the
filing of any document under the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (collectively, the &#147;<B>Exchange Act</B>&#148;) on or after the initial effective date of the Registration Statements, or the
date of the Basic Prospectuses, the Prospectus Supplement, the Prospectus or such Permitted Free Writing Prospectus, as the case may be, and deemed to be incorporated therein by reference. References in this Agreement to financial statements or
other information that is &#147;contained,&#148; &#147;included,&#148; &#147;described,&#148; &#147;set forth&#148; or &#147;provided&#148; in the Registration Statements, the Basic Prospectuses, the Prospectus Supplement, the Prospectus or any
Permitted Free Writing Prospectus and any similar references shall, unless stated otherwise, include any information incorporated or deemed to be incorporated by reference therein as of the date of such document. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Partnership, the General Partner, the Selling Unitholder and each Agent agree as follows: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">1. <U>Issuance and Sale</U>.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) Upon the basis of the representations, warranties and agreements and subject to the terms and conditions set forth herein
and provided the Partnership and the General Partner provide the applicable Agent with any due diligence materials and information reasonably requested by such Agent necessary for such Agent to satisfy its due diligence obligations, on any Exchange
Business Day (as defined below) selected by the Partnership, the Partnership, on behalf of itself and in its capacity as agent and custodian for the Selling Unitholder (in such capacity for the Selling Unitholder, the &#147;<B>Custodian</B>&#148;),
and such Agent may enter into an agreement in accordance with Section&nbsp;2 hereof regarding the number of Units to be placed by such Agent, as agent, and the manner in which and other terms upon which such placement is to occur (each such
transaction being referred to as an &#147;<B>Agency Transaction</B>&#148;).&nbsp;The Partnership or the Custodian may also offer to sell the Units directly to an Agent, as principal, in which event such parties and, if
</P>
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requested by such parties, the Selling Unitholder, shall enter into a separate agreement (each, a &#147;<B>Terms Agreement</B>&#148;) in substantially the form of Exhibit&nbsp;A hereto (with such
changes thereto as may be agreed upon by the Partnership, the Custodian or the Selling Unitholder, as the case may be, and such Agent to accommodate a transaction involving more than one Agent), relating to such sale in accordance with
Section&nbsp;2(g) of this Agreement (each such transaction being referred to as a &#147;<B>Principal Transaction</B>&#148;).&nbsp;As used herein, (i)&nbsp;the &#147;<B>Term</B>&#148; shall be the period commencing on the date hereof and ending on
the earlier of (x)&nbsp;the date on which the aggregate Gross Sales Price of Primary Units issued and sold pursuant to this Agreement and any Terms Agreements is equal to the Maximum Amount and (y)&nbsp;any termination of this Agreement pursuant to
Section&nbsp;9, (ii)&nbsp;an &#147;<B>Exchange Business Day</B>&#148; means any day during the Term that is a trading day for the Exchange other than a day on which trading on the Exchange is scheduled to close prior to its regular weekday closing
time, and (iii)&nbsp;&#147;<B>Exchange</B>&#148; means the New York Stock Exchange. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Subject to the terms and
conditions set forth below, the Partnership and the Selling Unitholder appoint each Agent as agent in connection with the offer and sale of Units in any Agency Transactions entered into hereunder.&nbsp;Each Agent will use its respective commercially
reasonable efforts, consistent with its normal trading and sales practices, to sell such Units in accordance with the terms and subject to the conditions hereof and of the applicable Transaction Acceptance (as defined below).&nbsp;None of the
Partnership, the Selling Unitholder or any Agent shall have any obligation to enter into an Agency Transaction.&nbsp;The Partnership shall be obligated to issue and sell Primary Units, and the Selling Unitholder shall be obligated to sell Secondary
Units, through the Agents, and each Agent shall be obligated to use its respective commercially reasonable efforts, consistent with its normal trading and sales practices and as provided herein and in the applicable Transaction Acceptance, to place
Units only if and when the Partnership or Custodian makes a Transaction Proposal (as defined below) to such Agent related to such an Agency Transaction and a Transaction Acceptance related to such Agency Transaction has been delivered to the
Partnership or Custodian by such Agent as provided in Section&nbsp;2 below. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) Each Agent, as agent in any Agency
Transaction, hereby covenants and agrees, severally and not jointly, not to make any sales of any Units on behalf of any Selling Party pursuant to this Agreement other than (i)(A)&nbsp;by means of ordinary brokers&#146; transactions between members
of the Exchange that qualify for delivery of a Prospectus in accordance with Rule&nbsp;153 under the Securities Act and meet the definition of an &#147;at the market offering&#148; under Rule&nbsp;415(a)(4) under the Securities Act (such
transactions are hereinafter referred to as &#147;<B>At the Market Offerings</B>&#148;), (B)&nbsp;to or through a market maker or (C)&nbsp;directly on or through any other national securities exchange or facility thereof, a trading facility of a
national securities association, an alternative trading system, an electronic communication network, a &#147;dark pool&#148; or any similar market venue and (ii)&nbsp;such other sales of the Units on behalf of any Selling Party as shall be agreed by
the Partnership, and if applicable, the Custodian, and such Agent in writing. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) If Units are to be sold in an Agency
Transaction in an At the Market Offering, the applicable Agent will confirm in writing to the Partnership the number of Units sold on any Exchange Business Day, and the related Gross Sales Price and Net Sales Price (as is defined in
Section&nbsp;2(b) below) no later than the opening of trading on the immediately following Exchange Business Day. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) If a
Selling Party shall default on its obligation to deliver Units to an Agent pursuant to the terms of any Agency Transaction or Terms Agreement, the defaulting Selling Party shall (i)&nbsp;indemnify and hold harmless such Agent and its successors and
assigns from and against any and all losses, claims, damages, liabilities and expenses arising from or as a result of such default and (ii)&nbsp;notwithstanding any such default by such selling party, pay to such Agent the commission to which it
would otherwise be entitled in connection with such sale in accordance with Section&nbsp;2(b) below. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) Each Selling
Party acknowledges and agrees that (i)&nbsp;there can be no assurance that an Agent will be successful in selling the Units, (ii)&nbsp;no Agent shall incur any liability or obligation to the Selling Party or any other person or entity if it does not
sell Units for any reason other than a failure by such Agent to use its commercially reasonable efforts consistent with its normal trading and sales practices and applicable law and regulations to sell such Units in accordance with the terms of this
Agreement, and (iii)&nbsp;no Agent shall be under any obligation to purchase Units on a principal basis pursuant to this Agreement, except as may otherwise be specifically agreed by such Agent and the Partnership, Custodian or Selling Unitholder in
a Terms Agreement. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">2. <U>Transaction Acceptances and Terms Agreements</U>.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) The Partnership or Custodian may, from time to time during the Term, propose to an Agent that they enter into an Agency
Transaction to be executed on a specified Exchange Business Day or over a specified period of Exchange Business Days, which proposal shall be made to such Agent by telephone or by email from, in the case of the Partnership, any of the individuals
listed as an authorized representative of the Partnership by the Partnership in writing, from time to time, to make such sales, and in the case of the Selling Unitholder, the Custodian, and shall set forth the information specified below (each, a
&#147;<B>Transaction Proposal</B>&#148;).&nbsp;If such Agent agrees to the terms of such proposed Agency Transaction or if the Partnership or Custodian and such Agent, mutually agree to modified terms for such proposed Agency Transaction, then such
Agent shall promptly deliver to the Partnership or Custodian by email a notice (each, a &#147;<B>Transaction Acceptance</B>&#148;) confirming the terms of such proposed Agency Transaction as set forth in such Transaction Proposal or setting forth
the modified terms for such proposed Agency Transaction as agreed by the Partnership or Custodian and such Agent, whereupon such Agency Transaction shall become a binding agreement between the Selling Party and such Agent.&nbsp;Each Transaction
Proposal shall specify: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) the Exchange Business Day(s) on which the Units subject to such Agency Transaction are
intended to be sold (each, a &#147;<B>Purchase Date</B>&#148;); </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) the maximum number of Units to be sold by such Agent
(the &#147;<B>Specified Number of Units</B>&#148;) on, or over the course of, such Purchase Date(s), or as otherwise agreed between the Partnership or Custodian and such Agent and documented in the relevant Transaction Acceptance; </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) the lowest price, if any, at which the Partnership or Custodian is willing to sell Units on each such Purchase Date or a
formula pursuant to which such lowest price shall be determined (each, a &#147;<B>Floor Price</B>&#148;); <I>provided</I>, <I>however</I>, that in no event shall the Floor Price be less than $1.00 per Unit; and </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iv) if other than 2.0% of the Gross Sales Price, such Agent&#146;s discount or commission. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">A Transaction Proposal delivered by the Partnership shall not set forth a Specified Number of Primary Units that, when added to
the aggregate Gross Sales Price of Units previously purchased and to be purchased pursuant to pending Transaction Acceptances (if any) hereunder and any Terms Agreements, results or could result in a total aggregate Gross Sales Price that exceeds
the Maximum Amount nor shall it set forth a Floor Price which is lower than the minimum price authorized from time to time by the Partnership.&nbsp;The Partnership shall have responsibility for maintaining records with respect to the aggregate Gross
Sales Price of Units sold and for otherwise monitoring the availability of Units for sale under the Partnership Registration Statement and for insuring that the aggregate Gross Sales Price of Units offered and sold does not exceed, and the price at
which any Units are offered or sold is not lower than, the Maximum Amount and the minimum price authorized from time to time by the Partnership, respectively.&nbsp;A Transaction Proposal delivered by the Custodian, on behalf of the Selling
Unitholder, shall not set forth a Specified Number of Secondary Units that, when added to the aggregate number of Secondary Units previously purchased and to be purchased pursuant to pending Transaction Acceptances (if any) hereunder and any Terms
Agreements, results or could result in a total number of Secondary Units sold exceeding the number authorized pursuant to the Secondary Unit 2017 Limitation, the Selling Unitholder Registration Statement and the Prospectus nor shall it set forth a
Floor Price which is lower than the minimum price authorized from time to time by the Custodian.&nbsp;The Custodian shall have responsibility for monitoring the availability of Units for sale under the Secondary Unit 2017 Limitation, the Selling
Unitholder Registration Statement and the Prospectus and for insuring that the aggregate Secondary Units offered and sold does not exceed, and the price at which any Secondary Units are offered or sold is not lower than, the number of Secondary
Units authorized pursuant to the Secondary Unit 2017 Limitation, the Selling Unitholder Registration Statement and the Prospectus and the minimum price authorized </P>
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from time to time by the Custodian, respectively. In the event that more than one Transaction Acceptance with respect to any Purchase Date(s) is delivered by the applicable Agent to the
Partnership or Custodian, the latest Transaction Acceptance shall govern any sales of Units for the relevant Purchase Date(s), except to the extent of any action occurring pursuant to a prior Transaction Acceptance and prior to the delivery to the
Partnership or Custodian of the latest Transaction Acceptance.&nbsp;The Partnership or Custodian or the applicable Agent, may, upon notice to the other applicable party by telephone (confirmed promptly by e-mail), suspend or terminate the offering
of the Units pursuant to Agency Transactions for any reason; <I>provided</I>, <I>however</I>, that such suspension or termination shall not affect or impair the parties&#146; respective obligations with respect to the Units sold hereunder prior to
the giving of such notice or their respective obligations under any Terms Agreement.&nbsp;Notwithstanding the foregoing, if the terms of any Agency Transaction contemplate that Units shall be sold on more than one Purchase Date, then the Partnership
or Custodian and the applicable Agent shall mutually agree to such additional terms and conditions as they deem reasonably necessary in respect of such multiple Purchase Dates, and such additional terms and conditions shall be set forth in or
confirmed by, as the case may be, the relevant Transaction Acceptance and be binding to the same extent as any other terms contained therein. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) The Purchase Date(s) in respect of the Units deliverable pursuant to any Transaction Acceptance shall be set forth in or
confirmed by, as the case may be, the applicable Transaction Acceptance.&nbsp;Except as otherwise agreed between the Selling Party and an Agent, such Agent&#146;s commission for any Units sold through such Agent pursuant to this Agreement shall be a
percentage, not to exceed 2.0%, of the actual sales price of such Units (the &#147;<B>Gross Sales Price</B>&#148;), which commission shall be agreed separately by such Agent and the Partnership or Custodian; <I>provided</I>, <I>however</I>, that
such commission shall not apply when an Agent acts as principal, in which case such commission or a discount shall be set forth in the applicable Terms Agreement.&nbsp;At each Agent&#146;s election, such commission shall either be (i)&nbsp;set forth
and invoiced in periodic statements from such Agent to the Selling Party, with payment to be made by the Selling Party promptly after its receipt thereof or (ii)&nbsp;deducted by the Agent from the payment of the Gross Sales Price to the Selling
Party.&nbsp;Notwithstanding the foregoing, in the event a Selling Party engages an Agent for a sale of Units in an Agency Transaction that would constitute a &#147;distribution,&#148; within the meaning of Rule&nbsp;100 of Regulation&nbsp;M under
the Exchange Act, or a &#147;block,&#148; within the meaning of Rule&nbsp;10b-18(a)(5) under the Exchange Act, the Selling Party will provide such Agent, at such Agent&#146;s request and upon reasonable advance notice to the Selling Party, on or
prior to the Settlement Date the opinions of counsel, accountants&#146; letters and officer&#146;s certificates pursuant to Section&nbsp;6 hereof, each dated the Settlement Date, and such other documents and information as such Agent shall
reasonably request, and the Selling Party and such Agent will agree to compensation that is customary for such Agent with respect to such transaction.&nbsp;The Gross Sales Price less the applicable Agent&#146;s commission and after deduction for any
transaction fees, transfer taxes or similar taxes or fees imposed by any governmental, regulatory or self-regulatory organization in respect of the sale of the applicable Units is referred to herein at the &#147;<B>Net Sales Price</B>.&#148; </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) Payment of the Net Sales Price for Units sold by a Selling Party on any Purchase Date pursuant to a Transaction Acceptance
shall be made to the Selling Party by wire transfer of immediately available funds to the account of the Selling Party (which the Partnership or Custodian shall provide to the applicable Agent at least one Exchange Business Day prior to the
applicable Agency Settlement Date (as defined below)) against delivery of such Units to such Agent&#146;s account, or an account of such Agent&#146;s designee, at The Depository Trust Company through its Deposit and Withdrawal at Custodian System
(&#147;<B>DWAC</B>&#148;), or by such other means of delivery as may be agreed to by the Partnership or Custodian or both, as applicable, and such Agent. Such payment and delivery shall be made at or about 10:00&nbsp;a.m. (New York City time) on the
third Exchange Business Day (or such other day as may, from time to time, become standard industry practice for settlement of such a securities issuance or as agreed to by the Partnership or Custodian or both, as applicable, and such Agent)
following each Purchase Date (each, an &#147;<B>Agency Settlement Date</B>&#148;). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) If, as set forth in or confirmed
by, as the case may be, the related Transaction Acceptance, a Floor Price has been agreed to by the parties with respect to a Purchase Date, and the </P>
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applicable Agent thereafter determines and notifies the Partnership or Custodian that the Gross Sales Price for such Agency Transaction would not be at least equal to such Floor Price, then the
Partnership shall not be obligated to issue and sell, and Selling Unitholder shall not be obligated to sell, through such Agent, and such Agent shall not be obligated to place, the Units proposed to be sold pursuant to such Agency Transaction on
such Purchase Date, unless the Partnership or Custodian or both, as applicable, and such Agent otherwise agree in writing. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) If any party has reason to believe that the exemptive provisions set forth in Rule&nbsp;101(c)(1) of Regulation&nbsp;M
under the Exchange Act are not satisfied with respect to the Units, it shall promptly notify the other parties and sales of the Units under this Agreement, any Transaction Acceptance or any Terms Agreement shall be suspended until that or other
exemptive provisions have been satisfied in the reasonable judgment of each party.&nbsp;On or prior to the delivery of a prospectus that is required (whether physically or through compliance with Rule&nbsp;172 under the Securities Act or any similar
rule) in connection with the offering or sale of the Units, the Partnership shall calculate the average daily trading volume (as defined under &#147;<B>ADTV</B>&#148; by Rule&nbsp;100 of Regulation&nbsp;M under the Exchange Act) of the Common Units
based on market data provided by Bloomberg L.P. or such other sources as agreed upon by the Partnership and the applicable Agent. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) (i) If the Partnership or Custodian wishes to issue and sell the Units pursuant to this Agreement but other than as set
forth in Section&nbsp;2(a) of this Agreement, it will notify the applicable Agent of the proposed terms of the Principal Transaction.&nbsp;If such Agent, acting as principal, wishes to accept such proposed terms (which it may decline to do for any
reason in its sole discretion) or, following discussions with the Partnership or Custodian, wishes to accept amended terms, the Partnership or Custodian or both, as applicable, and such Agent shall enter into a Terms Agreement setting forth the
terms of such Principal Transaction. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) The terms set forth in a Terms Agreement shall not be binding on the Selling
Party or an Agent unless and until the Partnership or Custodian or both, as applicable, and such Agent have each executed and delivered such Terms Agreement accepting all of the terms of such Terms Agreement.&nbsp;In the event of a conflict between
the terms of this Agreement and the terms of a Terms Agreement, the terms of such Terms Agreement shall control. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) Each
sale of the Units to an Agent in a Principal Transaction shall be made in accordance with the terms of this Agreement and a Terms Agreement, which shall provide for the sale of such Units to, and the purchase thereof by, such Agent.&nbsp;A Terms
Agreement may also specify certain provisions relating to the reoffering of such Units by such Agent.&nbsp;The commitment of an Agent to purchase the Units pursuant to any Terms Agreement shall be deemed to have been made on the basis of the
representations, warranties and agreements of the Selling Party contained, and shall be subject to the terms and conditions set forth, in this Agreement and such Terms Agreement.&nbsp;Any such Terms Agreement shall specify the number of the Units to
be purchased by the applicable Agent pursuant thereto, the price to be paid to the Selling Party for such Units, any provisions relating to rights of, and default by, underwriters, if any, acting together with such Agent in the reoffering of the
Units, and the time and date (each such time and date being referred to herein as a &#147;<B>Principal Settlement Date</B>&#148;; and, together with any Agency Settlement Date, a &#147;<B>Settlement Date</B>&#148;) and place of delivery of and
payment for such Units. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) Notwithstanding any other provision of this Agreement, a Selling Party shall not offer, sell
or deliver, or request the offer or sale, of any Units pursuant to this Agreement (whether in an Agency Transaction or a Principal Transaction) and, by notice to each Agent given by telephone (confirmed promptly by email), shall cancel any
instructions for the offer or sale of any Units, and no Agent shall be obligated to offer or sell any Units during any period in which the Selling Party is, or could be deemed to be, in possession of material non-public information. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) If the Partnership or Custodian wishes to offer, sell or deliver, or request the offer or sale, of any Units to an Agent as
agent at any time during the period from and including the date on which the Partnership publicly announces its earnings, revenues or other results of operations (an &#147;<B>Earnings Announcement</B>&#148;) through and including the time that the
Partnership files a Quarterly Report on Form&nbsp;10&#150;Q or an Annual Report on Form&nbsp;10&#150;K that includes consolidated financial statements as of and for the </P>
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same period or periods, as the case may be, covered by such Earnings Announcement, the Partnership shall first (i)&nbsp;prepare and deliver to such Agent (with a copy to counsel for the Agents) a
Current Report on Form&nbsp;8&#150;K that includes substantially the same financial and related information (together with management&#146;s discussion and analysis thereof) that was included in such Earnings Announcement (other than any earnings
projections and similar forward-looking data and officers&#146; quotations) (each, an &#147;<B>Earnings</B><B>&nbsp;</B><B>8&#150;K</B>&#148;), in form and substance reasonably satisfactory to such Agent, and, prior to its filing, obtain the written
consent of such Agent to such filing (which consent shall not be unreasonably withheld), (ii)&nbsp;provide such Agent with the officer&#146;s certificate, opinions and letters of counsel and accountants&#146; letter specified in Section&nbsp;7(b)
through (d), inclusive, (iii)&nbsp;afford such Agent the opportunity to conduct a due diligence review in accordance with Section&nbsp;7(f) hereof prior to filing such Earnings&nbsp;8&#150;K and (iv)&nbsp;file such Earnings&nbsp;8&#150;K with the
Commission.&nbsp;For purposes of clarity, the parties hereto agree that (A)&nbsp;the delivery of any officer&#146;s certificate, opinion or letter of counsel or accountants&#146; letter pursuant to this Section&nbsp;2(i) shall not relieve the
Partnership from any of its obligations under this Agreement with respect to any Quarterly Report on Form&nbsp;10&#150;Q or Annual Report on Form&nbsp;10&#150;K, as the case may be, including, without limitation, the obligation of the Partnership
and the Selling Unitholder to deliver officer&#146;s certificates, opinions and letters of counsel and accountants&#146; letters as provided in Section&nbsp;7(b) through (d), inclusive, and (B)&nbsp;this Section&nbsp;2(i) shall in no way affect or
limit the operation of clause&nbsp;(i) of Section&nbsp;2(h) hereof, which shall have independent application.</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) Each
Selling Party agrees that any offer to sell, any solicitation of an offer to buy, or any sales of Units shall only be effected by or through only one of the Agents, which the Partnership shall select in its sole discretion, on any single given day
(subject to the exceptions set forth in Section&nbsp;5(m) below), but in no event by more than one Agent, and the Partnership shall in no event request that more than one Agent sell Units on the same day; <I>provided</I>, <I>however</I>, that the
foregoing limitation shall apply only with respect to an Agency Transaction. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(k) Anything in this Agreement to the
contrary notwithstanding, the Partnership shall not authorize the issuance and sale of, and no Agent, as agent, shall be obligated to use its commercially reasonable efforts, consistent with its normal trading and sales practices, to sell, any
Primary Units at a price lower than the minimum price set, or in a number with an aggregate Gross Sales Price in excess of the Maximum Amount authorized from time to time to be issued and sold under this Agreement and any Terms Agreement, in each
case by the Partnership, or in a number in excess of the number of Primary Units approved for listing on the Exchange, or in excess of maximum offering price for the Primary Units available for issuance on the Partnership Registration Statement or
as to which the Partnership has paid the applicable registration fee, it being understood and agreed by the parties hereto that compliance with any such limitations shall be the sole responsibility of the Partnership. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(l) Anything in this Agreement to the contrary notwithstanding, the Custodian, on behalf of the Selling Unitholder, shall not
authorize the sale of, and no Agent, as agent, shall be obligated to use its commercially reasonable efforts, consistent with its normal trading and sales practices, to sell, any Secondary Units at a price lower than the minimum price set, or in a
number in excess of the number of Secondary Units authorized from time to time to be issued and sold under this Agreement and any Terms Agreement, in each case by the Custodian, or in a number in excess of the number of Secondary Units available for
sale under the Secondary Unit 2017 Limitation, the Selling Unitholder Registration Statement or the Prospectus, it being understood and agreed by the parties hereto that compliance with any such limitations shall be the sole responsibility of the
Custodian.</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">3. <U>Representations and Warranties of the Partnership and the General Partner</U>.&nbsp;The Partnership and the General
Partner severally and jointly represent and warrant to, and agree with, each Agent, unless otherwise specified, on and as of (i)&nbsp;the date of this Agreement, (ii)&nbsp;each date on which the Partnership receives a Transaction Acceptance (the
&#147;<B>Time of Acceptance</B>&#148;), (iii)&nbsp;each date on which the Partnership executes and delivers a Terms Agreement, (iv)&nbsp;each Time of Sale (as defined in Section&nbsp;3(a)), (v)&nbsp;each Settlement Date and (vi)&nbsp;each Bring-Down
Delivery Date (as defined in Section&nbsp;7(b)) (each such date listed in (i) through (vi), a &#147;<B>Representation Date</B>&#148;), as follows: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) The Registration Statements have been filed with the Commission and declared effective; there is no order preventing or
suspending the use of the Registration Statements, the Prospectus or any </P>
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Permitted Free Writing Prospectus, and, to the knowledge of the Partnership, no proceeding for that purpose or pursuant to Section&nbsp;8A of the Securities Act against the Partnership or related
to the offering of the Units has been initiated or threatened by the Commission; the Registration Statements complied when they initially became effective, complies as of the date of this Agreement, as then amended or supplemented, as of each other
Representation Date will comply, in all material respects, with the requirements of the Securities Act; the conditions to the use of Form&nbsp;S-3 in connection with the offering and sale of the Units as contemplated hereby have been satisfied; the
Registration Statements meet, and the offering and sale of the Units as contemplated hereby comply with, the requirements of Rule&nbsp;415 under the Securities Act (including, without limitation, Rule&nbsp;415(a)(5)) in all material respects; the
Prospectus complied or will comply, at the time it was or will be filed with the Commission, and will comply, as then amended or supplemented, as of each Representation Date, in all material respects, with the requirements of the Securities Act; the
Registration Statements did not, as of the time of their initial effectiveness, and do not or will not, as then amended or supplemented, as of each Representation Date, contain an untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein not misleading; as of each Representation Date, the Prospectus, as then amended or supplemented, together with all of the then issued Permitted Free Writing Prospectuses, if
any, will not contain an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; <I>provided</I>,
<I>however</I>, that neither the Partnership nor the General Partner makes any representation or warranty with respect to any statement in or omission from the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus made in
reliance upon and in conformity with information concerning the Agents or the Selling Unitholder and furnished in writing by or on behalf of the Agents or the Selling Unitholder expressly for use in the Registration Statements, the Prospectus or
such Permitted Free Writing Prospectus (it being understood that such information consists solely of the information specified in Section&nbsp;10(b)).&nbsp;As used herein, &#147;<B>Time of Sale</B>&#148; means (i)&nbsp;with respect to each offering
of Units pursuant to this Agreement, the time of the Agents&#146; initial entry into contracts with investors for the sale of such Units and (ii)&nbsp;with respect to each offering of Units pursuant to any relevant Terms Agreement, the time of sale
of such Units. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Prior to the execution of this Agreement, the Partnership has not, directly or indirectly, offered or
sold any of the Units by means of any &#147;prospectus&#148; (within the meaning of the Securities Act) or used any &#147;prospectus&#148; (within the meaning of the Securities Act) in connection with the offer or sale of the Units, in each case
other than the Basic Prospectus or prior prospectus supplements to the Basic Prospectus.&nbsp;The Partnership represents and agrees that, unless it obtains the prior consent of the Agents, until the termination of this Agreement, it has not made and
will not make any offer relating to the Units that would constitute an &#147;issuer free writing prospectus&#148; (as defined in Rule&nbsp;433 under the Securities Act) or that would otherwise constitute a &#147;free writing prospectus&#148; (as
defined in Rule&nbsp;405 under the Securities Act) other than any Permitted Free Writing Prospectus.&nbsp;Any such free writing prospectus relating to the Units consented to by the Agents (including any Free Writing Prospectus prepared by the
Partnership solely for use in connection with the offering contemplated by a particular Terms Agreement) is hereinafter referred to as a &#147;<B>Permitted Free Writing Prospectus</B>&#148;.&nbsp;The Partnership has complied and will comply in all
material respects with the requirements of Rule&nbsp;433 under the Securities Act applicable to any Permitted Free Writing Prospectus, including timely filing with the Commission where required, legending and record keeping.&nbsp;The conditions set
forth in one or more of subclauses&nbsp;(i) through (iv), inclusive, of Rule&nbsp;433(b)(1) under the Securities Act are satisfied in all material respects, and the registration statement relating to the offering of the Units contemplated hereby, as
initially filed with the Commission, includes a prospectus that, other than by reason of Rule&nbsp;433 under the Securities Act, satisfies the requirements of Section&nbsp;10 of the Securities Act in all material respects; the Partnership is not
disqualified, by reason of Rule&nbsp;164(f) or (g) under the Securities Act, from using, in connection with the offer and sale of the Units, &#147;free writing prospectuses&#148; (as defined in Rule&nbsp;405 under the Securities Act) pursuant to
Rules&nbsp;164 and 433 under the Securities Act; and the Partnership is a <FONT STYLE="white-space:nowrap">&#147;well-known</FONT> seasoned issuer&#148; (as defined in Rule&nbsp;405 under the Securities Act).&nbsp;The Partnership has paid or, no
later than the business day after the date of this Agreement, will pay the registration fee for the offering of the Maximum Amount of Primary Units and the maximum number of Secondary Units to be sold hereunder pursuant to Rule&nbsp;457 under the
Securities Act. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) The Incorporated Documents, when they were filed with the Commission (or, if
any amendment with respect to any such document was filed, when such amendment was filed), complied in all material respects with the requirements of the Securities Act or the Exchange Act, as applicable, and none of such documents contained any
untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading; and any further
documents so filed during the Term and incorporated by reference in the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus, when such documents become effective or are filed with the Commission, as the case may be, will
comply in all material respects with the requirements of the Securities Act or the Exchange Act, as applicable, and will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein, in the light of the circumstances under which they were made, not misleading. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) Each of
the Partnership, the General Partner, MPLX Operations LLC, a Delaware limited liability company (the &#147;<B>Operating Company</B>&#148;), Hardin Street Marine LLC, a Delaware limited liability company (&#147;<B>HSM</B>&#148;), MPLX Pipe Line
Holdings LLC, a Delaware limited liability company (&#147;<B>Pipe Line Holdings</B>&#148;), Marathon Pipe Line LLC, a Delaware limited liability company (&#147;<B>MPL</B>&#148;), MPLX Terminal and Storage LLC, a Delaware limited liability company
(&#147;<B>MTS</B>&#148;), MWE GP LLC, a Delaware limited liability company (&#147;<B>MWE GP</B>&#148;), MarkWest Energy Partners L.P., a Delaware limited partnership (&#147;<B>MWE</B>&#148;), Ohio River Pipe Line LLC, a Delaware limited liability
company (&#147;<B>ORPL</B>&#148;), and each of the entities identified on Exhibit&nbsp;D hereto (the &#147;<B>MWE Subsidiaries</B>&#148; and, together with the Partnership, the General Partner, the Operating Company, Pipe Line Holdings, MPL, ORPL,
MTS, MWE GP and MWE, the &#147;<B>MPLX Entities</B>&#148;) (other than Wirth Gathering, an Oklahoma general partnership (&#147;<B>Wirth Gathering</B>&#148;)) has been duly formed and is validly existing in good standing as a corporation, limited
partnership or limited liability company, as the case may be, under the Delaware General Corporation Law, the Delaware Revised Uniform Limited Partnership Act, the Delaware Limited Liability Company Act (the &#147;<B>Delaware LLC Act</B>&#148;), the
Texas Business Organizations Code (&#147;<B>TBOC</B>&#148;), the Michigan Limited Liability Company Act (the &#147;<B>Michigan LLC Act</B>&#148;) or the Oklahoma Limited Liability Company Act (the &#147;<B>Oklahoma LLC Act</B>&#148;), as
applicable.&nbsp;Wirth Gathering has been duly formed and is validly existing as a general partnership under the laws of the State of Texas and the State of Oklahoma, respectively.&nbsp;Each of the MPLX Entities has full corporate, limited liability
company or partnership, as the case may be, power and authority to own, lease and operate its properties and conduct its business in all material respects, in each case, as described in the Registration Statements and the Prospectus, if any, and, in
the case of the Partnership, to issue, sell and deliver the Units. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) Each of the MPLX Entities is duly qualified to do
business as a foreign limited partnership, corporation or limited liability company, as the case may be, and is in good standing in each jurisdiction where the ownership or leasing of its properties or the conduct of its business requires such
qualification, except where the failure to be so qualified and in good standing would not be reasonably likely to have a material adverse effect on the business, properties, financial condition, results of operations or prospects of the MPLX
Entities, taken as a whole (a &#147;<B>Material Adverse Effect</B>&#148;). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The General Partner has all requisite power
and authority to act as general partner of the Partnership. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) The General Partner is the sole general partner of the
Partnership.&nbsp;As of the date of this Agreement and any Terms Agreement (and prior to the issuance of the Units hereunder or thereunder), the General Partner has a 2.0% general partner interest in the Partnership; such general partner interest
has been duly authorized and validly issued in accordance with the Second Amended and Restated Agreement of Limited Partnership of the Partnership, as amended (the &#147;<B>Partnership Agreement</B>&#148;); and the General Partner owns such general
partner interest free and clear of all liens, encumbrances, security interests, charges or other claims (&#147;<B>Liens</B>&#148;) (except (i)&nbsp;restrictions on transferability in the Partnership Agreement or (ii)&nbsp;as described in the
Registration Statements and the Prospectus); </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) The Primary Units have been duly authorized in accordance with the
Partnership Agreement and, the Secondary Units are, and when the Primary Units are issued and delivered and paid for as provided herein or in any Terms Agreement, as the case may be, will be, validly issued, fully paid (to the
</P>
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extent required under the Partnership Agreement) and non-assessable (except as such nonassessability may be affected by matters described in Sections&nbsp;17-303, 17-607 and 17-804 of the
Delaware Revised Uniform Limited Partnership Act (the &#147;<B>Delaware LP Act</B>&#148;) and as described in the Registration Statements and Prospectus. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) The Partnership owns all of the limited liability company interests in the Operating Company; such limited liability
company interests are duly authorized and validly issued in accordance with the limited liability company agreement of the Operating Company (as the same may be amended or restated from time to time, the &#147;<B>Operating Company LLC
Agreement</B>&#148;), and are fully paid (to the extent required by the Operating Company LLC Agreement) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;18-607 and 18-804 of the Delaware LLC Act); and the
Partnership owns such limited liability company interests free and clear of all Liens (except (i)&nbsp;restrictions on transferability in the Operating Company LLC Agreement, (ii)&nbsp;Liens created or arising under the credit agreement providing
for a $2&nbsp;billion unsecured revolving credit facility and $250&nbsp;million term loan facility, each dated November&nbsp;20, 2014, as amended (together, the &#147;<B>Credit Facility</B>&#148;), in each case among the Partnership, Wells Fargo,
National Association, as administrative agent, and the various lenders from time to time party thereto or (iii)&nbsp;as described in the Registration Statements and the Prospectus). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) The Operating Company owns all of the limited liability company interests in MTS; such limited liability company interests
are duly authorized and validly issued in accordance with the limited liability company agreement of MTS (as the same may be amended or restated from time to time, the &#147;<B>MTS LLC Agreement</B>&#148;), and are fully paid (to the extent required
by the MTS LLC Agreement) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;18-604 and 18-804 of the Delaware LLC Act); and the Operating Company owns such limited liability company interests free and clear of all
Liens (except (i)&nbsp;restrictions on transferability in the MTS LLC Agreement, (ii)&nbsp;Liens created or arising under the Credit Facility or (iii)&nbsp;as described in the Registration Statements and the Prospectus). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(k) The Operating Company owns all of the limited liability company interests of Pipe Line Holdings; such limited liability
company interests are duly authorized and validly issued in accordance with the limited liability company agreement of Pipe Line Holdings (the &#147;<B>Pipe Line Holdings LLC Agreement</B>&#148;) by the Operating Company as sole member (&#147;<B>MPL
Investment</B>&#148;), and are fully paid (except to the extent required under the Pipe Line Holdings LLC Agreement) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;18-604 and 18-804 of the Delaware LLC Act); and
the Operating Company owns such limited liability company interests free and clear of all Liens (except (i)&nbsp;restrictions on transferability in the Pipe Line Holdings LLC Agreement, (ii)&nbsp;Liens created or arising under the Credit Facility or
(iii)&nbsp;as described in the Registration Statements and the Prospectus). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(l) The Operating Company owns all of the
limited liability company interests of HSM; such limited liability company interests are duly authorized and validly issued in accordance with the limited liability company agreement of HSM (the &#147;<B>HSM LLC Agreement</B>&#148;) by the Operating
Company as sole member, and are fully paid (except to the extent required under the HSM LLC Agreement) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;18-604 and 18-804 of the Delaware LLC Act); and the Operating
Company owns such limited liability company interests free and clear of all Liens (except (i)&nbsp;restrictions on transferability in the HSM LLC Agreement, (ii)&nbsp;Liens created or arising under the Credit Facility or (iii)&nbsp;as described in
the Registration Statements and the Prospectus). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(m) Pipe Line Holdings owns all of the limited liability company
interests in each of MPL and ORPL; such limited liability company interests are duly authorized and validly issued in accordance with the limited liability company agreement of MPL (as the same may be amended or restated from time to time, the
&#147;<B>MPL LLC Agreement</B>&#148;) or the limited liability company agreement of ORPL (as the same may be amended or restated from time to time, the &#147;<B>ORPL LLC Agreement</B>&#148;), respectively, and are fully paid (to the extent required
by the MPL LLC Agreement or the ORPL LLC Agreement, as applicable) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;18-604 and 18-804 of the Delaware LLC Act); and Pipe Line Holdings owns such limited liability
company interests free and clear of all Liens (except (i)&nbsp;restrictions on transferability in the Pipe Line Holdings Partnership Agreement, (ii)&nbsp;Liens created or arising under the Credit Facility or (iii)&nbsp;as described in the
Registration Statements and the Prospectus). </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(n) MWE GP has all requisite power and authority to act as general partner of
MWE. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(o) MWE GP is the sole general partner of MWE.&nbsp;MWE GP has a 1.0% general partner interest in MWE; such general
partner interest has been duly authorized and validly issued in accordance with the Third Amended and Restated Agreement of Limited Partnership of MWE, as amended (the &#147;<B>MWE Partnership Agreement</B>&#148;); and MWE GP owns such general
partner interest free and clear of all liens, encumbrances, security interests, charges or other claims (&#147;<B>Liens</B>&#148;) (except (i)&nbsp;restrictions on transferability in the MWE Partnership Agreement, (ii)&nbsp;Liens created or arising
under the Credit Facility or (iii)&nbsp;as described in the Registration Statements and the Prospectus). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(p) The
Partnership owns all of the limited partner interests in MWE; such partnership interests are duly authorized and validly issued in accordance with the MWE Partnership Agreement and are fully paid (except to the extent required under the MWE
Partnership Agreement) and nonassessable (except as such nonassessability may be affected by Sections&nbsp;17-303, 17-607 and 17-804 of the Delaware LP Act); and the Partnership owns its partnership interests free and clear of all Liens (except
(i)&nbsp;restrictions on transferability in the MWE Partnership Agreement, (ii)&nbsp;Liens created or arising under the Credit Facility or (iii)&nbsp;as described in the Registration Statements and the Prospectus). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(q) Other than its ownership of the 2.0% general partner interest in the Partnership and the incentive distribution rights (the
&#147;<B>IDRs</B>&#148;), the General Partner does not own, directly or indirectly, any equity or long-term debt securities of any corporation, partnership, limited liability company, joint venture, association or other entity.&nbsp;Other than
(i)&nbsp;the Partnership&#146;s ownership of all of the limited liability company interests in the Operating Company, MPLXIF LLC and MWE GP and all of the limited partnership interests in MWE, (ii)&nbsp;the Operating Company&#146;s ownership of all
of the limited liability company interests in MTS, HSM and Pipe Line Holdings, (iii)&nbsp;Pipe Line Holdings&#146; ownership of all of the limited liability company interests in each of MPL and ORPL and (iv)&nbsp;MWE&#146;s direct or indirect
ownership of limited liability company interests, capital stock and partnership interests in the MWE Subsidiaries, none of the Partnership, the Operating Company, MWE, MTS, HSM, Pipe Line Holdings, MPL or ORPL own, directly or indirectly, any equity
or long-term debt securities of any corporation, partnership, limited liability company, joint venture, association or other entity. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(r) Each of the Partnership and the General Partner has all requisite power and authority to execute and deliver this Agreement
and any Terms Agreement and to perform its respective obligations hereunder or thereunder.&nbsp;The Partnership has all requisite power and authority to issue, sell and deliver the Primary Units in accordance with and upon the terms and conditions
set forth in this Agreement, any Terms Agreement, the Partnership Agreement, the Partnership Registration Statement, the Prospectus and any Permitted Free Writing Prospectus.&nbsp;At each Time of Sale, all partnership and limited liability company
action, as the case may be, required to be taken by the Partnership and the General Partner or any of their unitholders, partners or members for the authorization, issuance, sale and delivery of the Primary Units and the consummation of the
transactions contemplated by this Agreement and any Terms Agreement shall have been validly taken. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(s) This Agreement has
been duly authorized, executed and delivered by each of the Partnership and the General Partner and any Terms Agreement will have been duly authorized, executed and delivered by each of the Partnership and the General Partner. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(t) The Partnership Agreement has been duly authorized, executed and delivered by the General Partner and is a valid and
legally binding agreement of the General Partner, enforceable against the General Partner in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(u) The limited liability company agreement of the General Partner (as the same may be amended or restated from time to time)
has been duly authorized, executed and delivered and is a valid and legally binding agreement, enforceable in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(v) The limited liability company agreement of MPLXIF LLC (as the same may be amended or restated from time to time) has been
duly authorized, executed and delivered and is a valid and legally binding agreement, enforceable in accordance with its terms. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 11 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(w) The Partnership is the sole member of the Operating Company and is subject to
the terms of the Operating Company LLC Agreement, which is a valid and legally binding agreement of the Partnership, enforceable against the Partnership in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(x) The Operating Company is the sole member of MTS and is subject to the terms of the MTS LLC Agreement, which is a valid and
legally binding agreement, enforceable against the Operating Company in accordance with its terms. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(y) The Pipe Line
Holdings LLC Agreement has been duly authorized, executed and delivered by the Operating Company and is a valid and legally binding agreement, enforceable in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(z) Pipe Line Holdings is the sole member of MPL and is subject to the terms of the MPL LLC Agreement, which is a valid and
legally binding agreement of Pipe Line Holdings, enforceable against Pipe Line Holdings in accordance with its terms. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(aa)
Pipe Line Holdings is the sole member of ORPL and is subject to the terms of the ORPL LLC Agreement, which is a valid and legally binding agreement of Pipe Line Holdings, enforceable against Pipe Line Holdings in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(bb) The MWE Partnership Agreement has been duly authorized, executed and delivered by MWE GP (or a predecessor general partner
of MWE) and is a valid and legally binding agreement, enforceable in accordance with its terms. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(cc) The limited liability
company agreement of MWE GP (as the same may be amended or restated from time to time) has been duly authorized, executed and delivered and is a valid and legally binding agreement, enforceable in accordance with its terms. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(dd) The issued and outstanding membership interests, general partner interests and capital stock, as applicable, of each MWE
Subsidiary (i)&nbsp;have or has been duly authorized and validly issued in accordance with its partnership agreement or limited liability company agreement (collectively, the &#147;<B>MWE Agreements</B>&#148;), the certificate of formation or
conversion, certificate or articles of incorporation, bylaws or other constituent document as applicable, (ii)&nbsp;are fully paid (to the extent required under the MWE Agreements) and (iii)&nbsp;are non-assessable (except as such nonassessability
may be affected by Sections&nbsp;17-607 and 17-804 of each of the Delaware LP Act, Sections&nbsp;18-303, 18-607 and 18-804 of the Delaware LLC Act, Sections&nbsp;2033 and 2035 of the Oklahoma LLC Act, Section&nbsp;101.206 of the TBOC or
Section&nbsp;450.4308 of the Michigan LLC Act, as applicable). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ee) MWE directly or indirectly owns the partnership
interests, membership interests and capital stock, as applicable, in the MWE Subsidiaries as described in the Registration Statements and the Prospectus, in each case free and clear of all Liens (except (i)&nbsp;restrictions on transferability in
the organizational or governing documents of the MWE Subsidiaries, (ii)&nbsp;Liens created or arising under the Credit Facility or (iii)&nbsp;as described in the Registration Statements and the Prospectus). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ff) The MWE Agreements have been duly authorized, executed and delivered by the parties thereto, and are valid and legally
binding agreements of such parties, enforceable against such parties in accordance with their respective terms; <I>provided</I> that with respect to each such agreement described in Section&nbsp;3(s) through 3(cc), the enforceability thereof may be
limited by (A)&nbsp;bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar laws relating to or affecting creditors&#146; rights generally and by general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law) and (B)&nbsp;public policy, applicable law relating to fiduciary duties and indemnification and an implied covenant of good faith and fair dealing. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(gg) The execution and delivery by the Partnership and the General Partner of, and the performance by the Partnership and the
General Partner of their obligations under, this Agreement and any Terms Agreement, the issuance and sale of the Primary Units, the consummation of the transactions contemplated hereby or by any Terms Agreement, and the application of the proceeds
as described under </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 12 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; font-size:10pt; font-family:Times New Roman">
the caption &#147;Use of Proceeds&#148; in the Prospectus, in each case will not contravene any provision of applicable law or the formation, organizational or governing documents of the MPLX
Entities, any agreement or other instrument binding upon the MPLX Entities that is material to the MPLX Entities, taken as a whole, or any judgment, order or decree of any governmental body, agency or court having jurisdiction over the MPLX
Entities, and no consent, approval, authorization or order of, or qualification with, any governmental body or agency that has not already been obtained is required for the performance by the Partnership and the General Partner of their obligations
under this Agreement and any Terms Agreement, the issuance and sale of the Primary Units, the consummation of the transactions contemplated hereby and by any Terms Agreement, and the application of the proceeds as described under the caption
&#147;Use of Proceeds&#148; in the Prospectus, except such as may be required by the securities or blue sky laws of the various states in connection with the offer and sale of the Primary Units. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(hh) (i)&nbsp;None of the MPLX Entities is (A)&nbsp;in violation of its formation, organizational or governing documents or
(B)&nbsp;in default under any agreement, indenture or instrument, which default could reasonably be expected to have a Material Adverse Effect and (ii)&nbsp;no event or condition has occurred or exists which, with the giving of notice or the lapse
of time or both, would result in any such default specified in clause&nbsp;(i)(B) which could reasonably be expected to have a Material Adverse Effect or a violation specified in (i)(A).&nbsp;Except as described in the Registration Statements and
the Prospectus, none of the MPLX Entities is in violation of any law, ordinance, governmental rule or regulation or court decree to which it may be subject, which violation could reasonably be expected to have a Material Adverse Effect. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) No approval, authorization, consent or order of or filing with any federal, state, local or foreign governmental or
regulatory commission, board, body, authority or agency, or of or with any self-regulatory organization or other non-governmental regulatory authority (including, without limitation, the NYSE) applicable to it, is required in connection with the
issuance and sale of the Primary Units or the consummation by the Partnership of the transactions contemplated hereby or by any Terms Agreement, other than (i)&nbsp;registration of the Primary Units under the Securities Act, which has been effected
(or, with respect to any registration statement to be filed hereunder pursuant to Rule&nbsp;462(b) under the Securities Act, will be effected in accordance herewith) and registration under the Exchange Act, which has been effected, (ii)&nbsp;any
necessary qualification under the securities or blue sky laws of the various jurisdictions in which the Primary Units will be offered by the Agents, (iii)&nbsp;under the Conduct Rules of the Financial Industry Regulatory Authority, Inc.
(&#147;<B>FINRA</B>&#148;), (iv)&nbsp;any listing applications and related consents or any notices required by NYSE in the ordinary course of the offering of the Primary Units, (v)&nbsp;consents that have been or prior to each Time of Sale will be
obtained, (vi)&nbsp;consents that, if not obtained, would not have a Material Adverse Effect or materially impair the ability of the MPLX Entities to consummate any transactions contemplated by this Agreement or by any Terms Agreement,
(vii)&nbsp;filings with the Commission pursuant to Rule&nbsp;424(b) under the Securities Act, or (viii)&nbsp;filings with the Commission on Form&nbsp;8-K or otherwise with respect to this Agreement or required to be made in connection with the
transactions contemplated hereby or the registration of the Units under the Securities Act or the Exchange Act. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(jj)
Except as described in the Registration Statements, the Prospectus and any Permitted Free Writing Prospectus or as set forth in the Partnership Agreement, (i)&nbsp;no person has the right, contractual or otherwise, to cause the Partnership to issue
or sell to it any Common Units or other equity interests of the Partnership, (ii)&nbsp;no person has any preemptive rights, resale rights, rights of first refusal or other rights to purchase any Common Units or other equity interests of the
Partnership except for the General Partner&#146;s right to maintain its 2% general partnership interest in the Partnership, (iii)&nbsp;no person has the right to act as an agent or as a financial advisor to the Partnership in connection with the
offer and sale of the Primary Units, and (iv)&nbsp;upon the issuance and sale of the Units, except as contemplated by this Agreement and by any Terms Agreement, no person will have any such right specified in (i) or (ii).&nbsp;Except as described in
the Registration Statements, the Prospectus and any Permitted Free Writing Prospectus or as set forth in the Partnership Agreement, no person has the right, contractual or otherwise, to cause the Partnership to register under the Securities Act any
Common Units of or other equity interests in the Partnership or to include any such Common Units or interests in the Registration Statements or the offering contemplated thereby. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 13 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(kk) There are no legal or governmental investigations or proceedings pending or,
to the knowledge of the Partnership or the General Partner, threatened to which any of the MPLX Entities is or would be a party or of which any of their respective properties is or would be subject that would be required to be described in the
Registration Statements or the Prospectus that are not so described, or any statutes, regulations, contracts or other documents that would be required to be described in the Registration Statements or Prospectus or to be filed as exhibits to the
Registration Statements that are not described or filed as required. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ll) The Units, when issued or sold and delivered in
accordance with the terms of the Partnership Agreement, this Agreement and, if applicable, any Terms Agreement, against payment therefor as provided herein and therein, will conform in all material respects to the description thereof contained in
the Registration Statements and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(mm) To the Partnership&#146;s and the General Partner&#146;s knowledge,
PricewaterhouseCoopers LLP, who has certified the financial statements of the Partnership and its consolidated subsidiaries and delivered its report with respect to the audited consolidated financial statements and schedules included or incorporated
by reference in the Registration Statements and the Prospectus, is an independent public accountant with respect to the Partnership within the meaning of the Securities Act. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(nn) The historical financial statements included in or incorporated by reference into the Registration Statements and the
Prospectus, together with the related notes and schedules, present fairly in all material respects the combined financial position of the Partnership and its consolidated subsidiaries as of the dates indicated and the combined results of operations,
cash flows and changes in equityholders&#146; equity of the Partnership and its consolidated subsidiaries for the periods specified, comply as to form in all material respects with the requirements of the Securities Act and Exchange Act and have
been prepared in conformity with U.S. generally accepted accounting principles applied on a consistent basis during the periods involved; there are no financial statements (historical or pro forma) that are required to be included in the
Registration Statements or the Prospectus that are not included or incorporated by reference as required; the Partnership and its consolidated subsidiaries do not have any material liabilities or obligations, direct or contingent (including any
off-balance sheet obligations), not described in the Registration Statements or the Prospectus; and all disclosures contained in or incorporated by reference into the Registration Statements and the Prospectus regarding &#147;non-GAAP financial
measures&#148; (as such term is defined by the rules and regulations of the Commission) comply with Regulation&nbsp;G of the Exchange Act and Item&nbsp;10 of Regulation&nbsp;S-K under the Securities Act, to the extent applicable; any pro forma
financial statements and related notes incorporated by reference in the Registration Statements or the Prospectus comply in all material respects with the applicable requirements of the Securities Act and the Exchange Act, as applicable, present
fairly in all material respects the information shown therein, have been prepared in accordance with the Commission&#146;s rules and guidelines with respect to pro forma financial statements in all material respects and have been properly compiled
in all material respects on the bases described therein, and the assumptions used in the preparation thereof are reasonable and the adjustments used therein are appropriate to give effect to the transactions and circumstances referred to therein.
</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(oo) Subsequent to the respective dates as of which information is given in the Registration Statements, the Prospectus
and any Permitted Free Writing Prospectus, there has not been (i) any material adverse change, or any development involving a prospective material adverse change, in the business, properties, management, financial condition or results of operations
of the MPLX Entities taken as a whole, (ii) any obligation or liability, direct or contingent (including any off-balance sheet obligations), incurred by the MPLX Entities, which is material to the MPLX Entities taken as a whole, (iii) any material
change in the Common Units of the Partnership or outstanding indebtedness of the Partnership and its consolidated subsidiaries taken as a whole or (iv) any dividend or distribution of any kind declared, paid or made on the ownership interests of the
Partnership, in each case other than as described in the Registration Statements and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(pp) None of the MPLX
Entities is now and, immediately after giving effect to the offering and sale of the Primary Units and the application of the proceeds thereof as described in the Prospectus or </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 14 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; font-size:10pt; font-family:Times New Roman">
any Permitted Free Writing Prospectus, will be, required to register as an &#147;investment company,&#148; as such term is defined in the Investment Company Act of 1940, as amended. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(qq) At each Time of Sale, except as described in the Registration Statements and the Prospectus and except to the extent that
failure of the following to be true, individually or in the aggregate, would not have a Material Adverse Effect:&nbsp;(i)&nbsp;the MPLX Entities will have indefeasible title to all real property and good title to all personal property described in
the Registration Statements and the Prospectus as being owned by any of them, free and clear of all Liens, except Liens described therein and Liens that do not materially interfere with the use of such properties, taken as a whole, as they have been
used in the past and are proposed to be used in the future as described in the Registration Statements and the Prospectus; and (ii)&nbsp;all the property described in the Registration Statements and the Prospectus as being held under lease by the
MPLX Entities will be held thereby under valid, subsisting and enforceable leases, except as do not materially interfere with the use of such properties, taken as a whole, as they have been used in the past and are proposed to be used in the future
as described in the Registration Statements and the Prospectus. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(rr) The MPLX Entities (i)&nbsp;are in compliance with all
applicable foreign, federal, state and local laws and regulations relating to the protection of human health and safety (with respect to hazardous or toxic substances) or the environment, including with respect to releases of hazardous or toxic
substances or wastes, pollutants or contaminants (&#147;<B>Environmental Laws</B>&#148;), (ii)&nbsp;possess all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses,
(iii)&nbsp;are in compliance with all terms and conditions of any such permit, license or approval, except where such noncompliance with Environmental Laws, failure to receive required permits, licenses or other approvals or failure to comply with
the terms and conditions of such permits, licenses or approvals would not, singly or in the aggregate, reasonably be expected to have a Material Adverse Effect. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ss) To the knowledge of the Partnership and General Partner, other than as disclosed in the Registration Statements and the
Prospectus, there has been no release, spill or disposal of, exposure to, hazardous or toxic substances or wastes that would form the basis of a claim against the MPLX Entities, and the MPLX Entities have no other liabilities or costs, under
Environmental Laws, other than claims, costs and liabilities that would not reasonably be expected to have a Material Adverse Effect. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(tt) All tax returns required to be filed by the MPLX Entities have been timely filed (within any applicable time limit
extensions permitted by the relevant tax authority), except for tax returns as to which the failure to file would not have, individually or in the aggregate, a Material Adverse Effect, and all taxes and other assessments of a similar nature (whether
imposed directly or through withholding) including any interest, additions to tax or penalties applicable thereto due or claimed to be due from such entities have been timely paid, other than (i)&nbsp;those being contested in good faith and for
which adequate reserves have been provided and (ii)&nbsp;those which if not paid, would not have, individually or in the aggregate, a Material Adverse Effect. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(uu) The MPLX Entities maintain, or are entitled to the benefits of, insurance covering their respective properties,
operations, personnel and businesses against such losses and risks as are reasonably adequate to protect the MPLX Entities and their respective businesses in a commercially reasonable manner. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vv) The Partnership and its subsidiaries, taken as a whole, maintain a system of internal accounting controls sufficient to
provide reasonable assurance that (i)&nbsp;transactions are executed in accordance with management&#146;s general or specific authorization; (ii)&nbsp;transactions are recorded as necessary to permit preparation of financial statements in conformity
with generally accepted accounting principles in the United States and to maintain accountability for assets; (iii)&nbsp;access to assets is permitted only in accordance with management&#146;s general or specific authorization; and (iv)&nbsp;the
recorded accountability for assets is compared with existing assets at reasonable intervals and appropriate action is taken with respect to any differences; the Partnership&#146;s and its subsidiaries&#146; internal accounting controls were
effective as of the end of the Partnership&#146;s most recently completed fiscal year and neither the Partnership nor the General Partner is aware of any material weaknesses in the internal accounting controls over financial reporting of the MPLX
Entities. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 15 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ww) The Partnership has established and maintains &#147;disclosure controls and
procedures&#148; (as such term is defined in Rule&nbsp;13a-15 under the Exchange Act); such disclosure controls and procedures are designed to ensure that material information required to be disclosed by the Partnership in the reports to be filed or
submitted under the Exchange Act, as applicable, is accumulated and communicated to management of the General Partner, including its Chief Executive Officer and its Chief Financial Officer, as appropriate, to allow timely decisions regarding
required disclosure to be made, and such disclosure controls and procedures are effective in all material respects as of the end of the Partnership&#146;s most recently completed fiscal quarter to perform the functions for which they were
established to the extent required by Rule&nbsp;13a-15 of the Exchange Act; and the Partnership is and will be and, to the knowledge of the Partnership, the officers and directors of the General Partner, in their capacities as such, are and will be,
in compliance in all material respects with the applicable provisions of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated thereunder. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(xx) None of the MPLX Entities nor, to the knowledge of the Partnership or the General Partner, any director, officer, agent,
employee or affiliate of the MPLX Entities (in their capacity as directors, officers, agents, employees or affiliates) has taken any action, directly or indirectly, that would result in a violation or sanction for violation by such persons of the
Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder, and the MPLX Entities and, to the knowledge of the Partnership and the General Partner, their respective affiliates have instituted and maintain policies
and procedures designed to comply therewith. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(yy) The operations of the MPLX Entities are and have been conducted at all
times in compliance with applicable financial recordkeeping and reporting requirements of the Bank Secrecy Act of 1970, as amended by Title&nbsp;III of the USA Patriot Act, the applicable money laundering statutes of all jurisdictions where any of
the MPLX Entities conducts business, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any governmental agency (collectively, the &#147;<B>Money Laundering
Laws</B>&#148;); and no action, suit or proceeding by or before any court or governmental agency, authority or body or any arbitrator involving any of the MPLX Entities with respect to the Money Laundering Laws is pending or, to the knowledge of the
Partnership and General Partner, threatened. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(zz) Each of the Partnership and the General Partner acknowledges that, in
accordance with the requirements of the USA Patriot Act, the Agents are required to obtain, verify and record information that identifies their respective clients, including the Partnership, which information may include the name and address of
their respective clients, as well as other information that will allow the Agents to properly identify their respective clients. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(aaa) (i) None of the MPLX Entities, nor to the knowledge of the Partnership or the General Partner, any director, officer,
agent, employee or affiliate of any MPLX Entity or representative thereof, is an individual or entity (&#147;<B>Person</B>&#148;) that is, or is owned or controlled by a Person that is: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(A) the subject of any sanctions administered or enforced by the U.S. Department of Treasury&#146;s Office of Foreign Assets
Control or other relevant sanctions authority (collectively, &#147;<B>Sanctions</B>&#148;), nor </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(B) located, organized or
resident in a country or territory that is the subject of Sanctions (including, without limitation, Cuba, Iran, North Korea, Sudan and Syria). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) the MPLX Entities will not, directly or indirectly, use the proceeds of the offering, or lend, contribute or otherwise
make available such proceeds to any other MPLX Entity, joint venture partner or other Person: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(A) to fund or facilitate
any activities or business of or with any Person or in any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 16 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(B) in any other manner that will result in a violation of Sanctions by any
Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii)
the MPLX Entities have not knowingly engaged in, are not now knowingly engaged in, and will not knowingly engage in, any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or
was the subject of Sanctions. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(bbb) At each Time of Sale, no direct or indirect subsidiary of the Partnership will be
prohibited, directly or indirectly, from paying any distributions to the Partnership, from making any other distribution on such subsidiary&#146;s ownership interests, from repaying to the Partnership any loans or advances to such subsidiary from
the Partnership or from transferring any of such subsidiary&#146;s property or assets to the Partnership or any other subsidiary of the Partnership, except as described in or contemplated by the Registration Statements and the Prospectus or
contemplated by the organizational or governing documents of a joint venture of which an MPLX Entity is partner or co-venturer. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ccc) The Common Units are listed on the NYSE, and at each Time of Sale, the Primary Units will have been approved for listing
on the NYSE, subject only to official notice of issuance. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ddd) None of the MPLX Entities has taken, directly or
indirectly, any action designed, or which has constituted or might reasonably be expected to constitute the stabilization or manipulation of the price of the Common Units to facilitate the sale or resale of the Primary Units in violation of any law,
rule or regulation. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(eee) The interactive data in eXtensible Business Reporting Language incorporated by reference in the
Registration Statements and the Prospectus fairly presents the information called for in all material respects and has been prepared in all material respects in accordance with the Commission&#146;s rules and guidelines applicable thereto. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(fff) There is no franchise, contract or other document required to be described in the Registration Statements or the
Prospectus, or to be filed as an exhibit to the Registration Statements, that is not described or filed as required). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ggg) The Common Units are an &#147;actively-traded security&#148; excepted from the requirements of Rule&nbsp;101 of
Regulation&nbsp;M under the Exchange Act by Rule&nbsp;101(c)(1) thereunder. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In addition, any certificate signed by any officer of an MPLX
Entity and delivered to the Agents or counsel for the Agents in connection with the offering of the Units shall be deemed to be a representation and warranty by such MPLX Entity, as to the matters covered thereby, to the Agents. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">4. <U>Representations and Warranties of the Selling Unitholder</U>.&nbsp;The Selling Unitholder represents and warrants to, and agrees with,
each Agent, unless otherwise specified, on and as of (i)&nbsp;the date of this Agreement, (ii)&nbsp;each date on which the Custodian receives a Transaction Acceptance, (iii)&nbsp;each date on which the Custodian or Selling Unitholder executes and
delivers a Terms Agreement, (iv)&nbsp;each Settlement Date and (vi)&nbsp;each Bring-Down Delivery Date (as defined in Section&nbsp;7(b)) (each such date listed in (i) through (vi), a &#147;<B>Representation Date</B>&#148;), as follows: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) The Selling Unitholder is the record and beneficial owner of the Secondary Units to be sold by it hereunder free and clear
of all Liens and has full power and authority to sell its interest in such Secondary Units, and upon the delivery of, against payment for, such Secondary Units pursuant to this Agreement, any purchaser will acquire good and marketable title thereto,
free and clear of any Liens. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) The Selling Unitholder has not taken, directly or indirectly, any action designed to or
that would constitute or that might reasonably be expected to cause or result in, under the Exchange Act or otherwise, stabilization or manipulation of the price of any security of the Partnership to facilitate the sale or resale of the Secondary
Units. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 17 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) The Secondary Units have been placed in custody for delivery pursuant to the
terms of this Agreement in favor of the Custodian; the Secondary Units so held in custody by the Partnership for the Selling Unitholder are subject to the interests hereunder of the Agents; the arrangements for custody and delivery of such Secondary
Units made by the Selling Unitholder hereunder, are not subject to termination by any acts of the Selling Unitholder, or by operation of law, whether by the death or incapacity of the Selling Unitholder or the occurrence of any other event; and if
any such death, incapacity or any other such event shall occur before the delivery of such Units hereunder, certificates for the Secondary Units will be delivered by the Custodian in accordance with the terms and conditions of this Agreement as if
such death, incapacity or other event had not occurred, regardless of whether or not the Custodian shall have received notice of such death, incapacity or other event. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) No consent, approval, authorization or order of any court or governmental agency or body is required for the consummation
by the Selling Unitholder of the transactions contemplated herein, except such as may have been obtained.</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) Neither the
sale of the Units being sold by the Selling Unitholder nor the consummation of any other of the transactions herein contemplated by the Selling Unitholder or the fulfillment of the terms hereof by the Selling Unitholder or the Custodian on behalf of
the Selling Unitholder will conflict with, result in a breach or violation of, or constitute a default under any law or the certificate of formation or limited liability company agreement of the Selling Unitholder or the terms of any indenture or
other agreement or instrument to which the Selling Unitholder is a party or bound, or any judgment, order or decree applicable to the Selling Unitholder of any court, regulatory body, administrative agency, governmental body or arbitrator having
jurisdiction over the Selling Unitholder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) This Agreement and any Terms Agreement delivered by the Selling Unitholder
have been duly authorized, executed and delivered by or on behalf of the Selling Unitholder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) As of the date of this
Agreement, at each Time of Sale and at each Settlement Date, the Selling Unitholder Registration Statement or the Prospectus did not or will not contain any untrue statement of a material fact or omit to state any material fact necessary in order to
make the statements therein, in the light of the circumstances under which they were made, not misleading; provided that the foregoing representations and warranties in this Section&nbsp;4(g) relate only to information in the Selling Unitholder
Registration Statement or Prospectus relating to or dealing with the Selling Unitholder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) The Custodian is authorized
to carry out any and all acts on behalf of the Selling Unitholder and make all directions, confirmations and orders to the Agents required to be performed by the Selling Unitholder under the provisions of this Agreement. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) The sale of the Secondary Units by the Selling Unitholder pursuant to this Agreement is not prompted by any material
information concerning the Partnership or any of its direct or indirect subsidiaries that is not set forth in the Registration Statements, Prospectus and any Permitted Free Writing Prospectus. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) (i) None of the Selling Unitholder, nor to the knowledge of the Selling Unitholder, any director, officer, agent, employee
or affiliate of the Selling Unitholder or representative thereof, is a Person that is, or is owned or controlled by a Person that is: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(A) the subject of any Sanctions </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(B) located, organized or resident in a country or territory that is the subject of Sanctions (including, without limitation,
Cuba, Iran, North Korea, Sudan and Syria). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) the Selling Unitholder will not knowingly, directly or indirectly, use the
proceeds of the offering, or lend, contribute or otherwise make available such proceeds to any subsidiary, joint venture partner or other Person: </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 18 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(A) to fund or facilitate any activities or business of or with any Person or in
any country or territory that, at the time of such funding or facilitation, is the subject of Sanctions; or </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:13%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(B) in any
other manner that will result in a violation of Sanctions by any Person (including any Person participating in the offering, whether as underwriter, advisor, investor or otherwise). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) the Selling Unitholder has not knowingly engaged in, is not now knowingly engaged in, and will not knowingly engage in,
any dealings or transactions with any Person, or in any country or territory, that at the time of the dealing or transaction is or was the subject of Sanctions. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">5. <U>Certain Covenants of the Partnership, the General Partner and the Selling Unitholder</U>.&nbsp;The Partnership and the General Partner
hereby agree, and the Selling Unitholder solely with respect to Sections&nbsp;5(d), 5(j), 5(l), 5(m) and 5(p), agree with each Agent that: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) For so long as the delivery of a prospectus is required (whether physically or through compliance with Rule&nbsp;172 under
the Securities Act or any similar rule) in connection with the offering or sale of Units, before using or filing any Permitted Free Writing Prospectus and before using or filing any amendment or supplement related to the offering of the Units to the
Registration Statements, the Prospectus or any Permitted Free Writing Prospectus (in each case, other than due to the filing of an Incorporated Document), to furnish to each Agent a copy of each such proposed Permitted Free Writing Prospectus,
amendment or supplement within a reasonable period of time before filing with the Commission or using any such Permitted Free Writing Prospectus, amendment or supplement and the Partnership will not use or file any such Permitted Free Writing
Prospectus or any such proposed amendment or supplement to which an Agent reasonably objects, unless the Partnership&#146;s legal counsel has advised the Partnership that use or filing of such document is required by law, rule or regulation; and the
Partnership will not use or file any such Permitted Free Writing Prospectus or proposed, amendment or supplement to which an Agent reasonably objects unless the Partnership&#146;s legal counsel has advised the Partnership that use or filing of such
document is required by law rule or regulation. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) To file the Prospectus, each Prospectus Supplement and any other
amendments or supplements to the Prospectus pursuant to, and within the time period required by, Rule&nbsp;424(b) under the Securities Act (without reference to Rule&nbsp;424(b)(8)) and to file any Permitted Free Writing Prospectus to the extent
required by Rule&nbsp;433 under the Securities Act and to provide copies of the Prospectus, each Prospectus Supplement, any other amendments or supplements related to the offering of the Units to the Prospectus and each Permitted Free Writing
Prospectus (to the extent not previously delivered or filed on the Commission&#146;s Electronic Data Gathering, Analysis and Retrieval system or any successor system thereto (collectively, &#147;<B>EDGAR</B>&#148;)) to the Agents via e-mail in
&#147;.pdf&#148; format on such filing date to an e-mail account designated by each Agent and, at an Agent&#146;s request, to also furnish copies of the Prospectus, each Prospectus Supplement, any other amendments or supplements related to the
offering of the Units to the Prospectus and each Permitted Free Writing Prospectus to each exchange or market on which sales were effected as may be required by the rules or regulations of such exchange or market. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) To file timely all reports and any definitive proxy or information statements required to be filed by the Partnership with
the Commission pursuant to Sections&nbsp;13(a), 13(c), 14 or 15(d) of the Exchange Act for so long as the delivery of a prospectus is required (whether physically or through compliance with Rule&nbsp;172 under the Securities Act or any similar rule)
in connection with the offering or sale of the Units, and during such same period to advise the Agents, promptly after the Partnership receives notice thereof, (i)&nbsp;of the time when any amendment to the Registration Statements related to the
offering of the Units has been filed or has become effective or any supplement related to the offering of the Units to the Prospectus or any Permitted Free Writing Prospectus or any amended Prospectus related to the offering of the Units has been
filed with the Commission; (ii)&nbsp;of the issuance by the Commission of any stop order or any order preventing or suspending the use of any prospectus relating to the Units or the initiation or threatening of any proceeding for that purpose,
pursuant to Section&nbsp;8A of the Securities Act; (iii)&nbsp;of the suspension of the qualification of the Units for offering or sale in any jurisdiction or of the initiation or </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 19 - </P>


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threatening of any proceeding for any such purpose; (iv)&nbsp;of any request by the Commission for the amendment of the Registration Statements related to the offering of the Units or the
amendment or supplementation of the Prospectus related to the offering of the Units (in each case including any documents incorporated by reference therein) or for additional information related to the offering of the Units; (v)&nbsp;of the
occurrence of any event as a result of which the Prospectus or any Permitted Free Writing Prospectus as then amended or supplemented includes any untrue statement of a material fact or omits to state a material fact required to be stated therein or
necessary in order to make the statements therein, in the light of the circumstances existing when the Prospectus or any such Permitted Free Writing Prospectus is delivered to a purchaser, not misleading; and (vi)&nbsp;of the receipt by the
Partnership of any notice of objection of the Commission to the use of the Registration Statements or any post-effective amendment thereto. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) To furnish such information as may be reasonably required and otherwise reasonably cooperate in qualifying the Units for
offering and sale under the securities or blue sky laws of such states of the United States as the Agents may reasonably designate and to maintain such qualifications in effect so long as required for the distribution of the Units; <I>provided</I>
that neither the Partnership nor the Selling Unitholder shall be required to qualify as a foreign corporation, become a dealer of securities, or become subject to taxation in, or to consent to the service of process under the laws of, any such state
or other jurisdictions (except service of process with respect to the offering and the sale of the Units); and to promptly advise the Agents of the receipt by the Partnership or the Selling Unitholder of any notification with respect to the
suspension of the qualification of the Units for sale in any state of the United States or the initiation of any proceeding for such purpose. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) To make available to the Agents at their respective offices, without charge, from time to time, as many copies of the
Prospectus and the Prospectus Supplement (or of the Prospectus or Prospectus Supplement as amended or supplemented if the Partnership shall have made any amendments or supplements thereto and documents incorporated by reference therein after the
effective date of the Registration Statements) and each Permitted Free Writing Prospectus as the Agents may reasonably request for so long as the delivery of a prospectus is required (whether physically or through compliance with Rule&nbsp;172 under
the Securities Act or any similar rule), <I>provided</I>, <I>however</I>, that the Partnership and the General Partner shall have no obligation to provide the Agents with any document filed or furnished on EDGAR or included on the Partnership&#146;s
Internet website. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) To furnish or make available to the Agents during the Term (i)&nbsp;copies of any reports or other
communications which the Partnership shall send to its common unit holders or shall from time to time publish or publicly disseminate and (ii)&nbsp;copies of all annual, quarterly and current reports filed with the Commission on Forms&nbsp;10-K,
10-Q and 8-K, or such other similar form as may be designated by the Commission, and to furnish to the Agents from time to time during the Term such other information as the Agents may reasonably request regarding the Partnership or its
subsidiaries, in each case as soon as such reports, communications, documents or information becomes available or promptly upon the request of the Agents, as applicable; <I>provided</I>, <I>however</I>, that the Partnership and the General Partner
shall have no obligation to provide the Agents with any document filed or furnished on EDGAR or included on the Partnership&#146;s Internet website. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) If, at any time during the pendency of any Agency Transaction or a Principal Transaction, any event shall occur or
condition shall exist as a result of which it is necessary in the reasonable opinion of counsel for the Agents or counsel for the Partnership, to further amend or supplement the Prospectus or any Permitted Free Writing Prospectus as then amended or
supplemented in order that the Prospectus or any such Permitted Free Writing Prospectus will not include an untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary in order to make the
statements therein not misleading, in the light of the circumstances existing at the time the Prospectus or any such Permitted Free Writing Prospectus is delivered to a purchaser, the Partnership will, subject to Section&nbsp;5(a) above, promptly
prepare and file with the Commission such amendment or supplement, whether by filing documents pursuant to the Securities Act, the Exchange Act or otherwise, as may be necessary to correct such untrue statement or omission or to make the Prospectus
or any such Permitted Free Writing Prospectus comply with such requirements and, if at any time during the Term, it shall be necessary, in the reasonable opinion </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 20 - </P>


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of either such counsel, to amend or supplement the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus in order to comply with the requirements of the Securities Act,
in the case of such a determination by counsel to the Partnership, immediate notice shall be given, and confirmed in writing, to the Agents to cease the solicitation of offers to purchase the Units in the Agents&#146; capacity as agents and the
Partnership will, subject to Section&nbsp;5(a) above, promptly prepare and file with the Commission such amendment or supplement, whether by filing documents pursuant to the Securities Act, the Exchange Act or otherwise, as may be necessary to make
the Registration Statements, the Prospectus or any such Permitted Free Writing Prospectus comply with such requirements. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(h) To generally make available to its security holders as soon as reasonably practicable, but not later than 16&nbsp;months
after the first day of each fiscal quarter referred to below, an earnings statement (in form complying with the provisions of Section&nbsp;11(a) under the Securities Act and Rule&nbsp;158 of the Commission promulgated thereunder) covering each
twelve-month period beginning, in each case, not later than the first day of the Partnership&#146;s fiscal quarter next following each &#147;effective date&#148; (as defined in such Rule&nbsp;158) of the Registration Statements with respect to each
sale of Units. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) To apply the net proceeds from the sale of the Primary Units in the manner described in the Prospectus
Supplement under the caption &#147;Use of Proceeds.&#148; </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(j) Not to, and to cause its subsidiaries not to, take, directly
or indirectly, any action designed to cause or result in, or that constitutes or might reasonably be expected to constitute, the stabilization or manipulation of the price of any security of the Partnership to facilitate the sale or resale of the
Units; <I>provided</I> that nothing herein shall prevent the Partnership from filing or submitting reports under the Exchange Act, issuing press releases in the ordinary course of business or engaging in communications with investors in the ordinary
course of business. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(k) Except as otherwise agreed, to pay all costs, expenses, fees and taxes incurred by the
Partnership, the Selling Unitholder or the Agents in connection with (i)&nbsp;the preparation and filing of the Registration Statements, the Prospectus, any Permitted Free Writing Prospectus, and any amendments or supplements thereto, and the
printing and furnishing of copies of each thereof to the Agents and to dealers (including costs of mailing and shipment), (ii)&nbsp;the registration, issue and delivery of the Units, (iii)&nbsp;the qualification of the Units for offering and sale
under the securities or blue sky laws of such states or other jurisdictions as the Agents may reasonably designate as aforesaid including filing fees and the reasonable, documented, out-of-pocket legal fees and disbursements of counsel to the Agents
in connection therewith and the printing and furnishing of copies of any blue sky surveys to the Agents, (iv)&nbsp;the listing of the Units on the Exchange and any registration thereof under the Exchange Act, (v)&nbsp;any filing for review, and any
review, of the public offering of the Units by FINRA (including filing fees and the reasonable and documented legal fees and disbursements of counsel to the Agents in connection therewith), (vi)&nbsp;the fees and disbursements of counsel to the
Partnership and of the Partnership&#146;s independent registered public accounting firm (vii)&nbsp;the performance of the Partnership&#146;s other obligations hereunder and under any Terms Agreement and (viii)&nbsp;the reasonable, documented,
out-of-pocket expenses of the Agents, including the reasonable, documented, out-of-pocket fees and disbursements of counsel to the Agents in connection with this Agreement and ongoing services in connection with the transactions contemplated
hereunder; <I>provided</I>, <I>however</I>, that under no circumstances shall the Partnership or the General Partner be obligated to pay the underwriting fees, discounts and selling commissions (and similar fees or arrangements associated with) and
transfer taxes allocable to the sale of the Secondary Units by the Selling Unitholder. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(l) With respect to the offering(s)
contemplated by this Agreement or any Terms Agreement, neither the Partnership nor the Selling Unitholder will offer Common Units or any securities convertible into or exchangeable or exercisable for the Common Units in a manner in violation of the
Securities Act or the Exchange Act; and neither the Partnership nor the Selling Unitholder will distribute any offering material in connection with the offer and sale of the Units, other than the Registration Statements, the Prospectus or any
Permitted Free Writing Prospectus and any amendments or supplements thereto. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(m) Unless the Partnership has given written
notice to the Agents that the Partnership has suspended activity under this Agreement or there are no pending Agency Transactions or Principal Transactions, neither the Partnership nor the Selling Unitholder will, without giving the Agents at least
two </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 21 - </P>


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Exchange Business Days&#146; prior written notice specifying the nature of the proposed sale and the date of such proposed sale (i)&nbsp;offer, pledge, announce the intention to sell, sell,
contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise transfer or dispose of, directly or indirectly, any Common Units or other securities of
the Partnership that are substantially similar to Common Units or any securities convertible into or exercisable, redeemable or exchangeable for the foregoing, or file any registration statement under the Securities Act with respect to any of the
foregoing (other than a registration statement on Form S-8 or post-effective amendment to the Registration Statements) or (ii)&nbsp;enter into any swap or other agreement that transfers, in whole or in part, any of the economic consequences of
ownership of Common Units or other securities of the Partnership that are substantially similar to the Common Units, whether any such transaction described in clause&nbsp;(i) or (ii) above is to be settled by delivery of Common Units or other
securities, in cash or otherwise, and (iii)&nbsp;publicly announce an intention to effect any transaction described in clause&nbsp;(i) or (ii), except, in each case, for (A)&nbsp;the registration of the offer and sale of the Units as contemplated by
this Agreement and by any Terms Agreement, (B)&nbsp;issuances of Common Units upon the exercise of options or warrants or the conversion of limited partner interests convertible or exchangeable into Common Units, in each case, outstanding as of the
date hereof, (C)&nbsp;the grants or issuance of employee, officer or director equity awards pursuant to employee, officer or director equity-based compensation plans and the filing by the Partnership of a registration statement on Form&nbsp;S-8,
(D)&nbsp;any grants or issuances of Common Units upon exercise or vesting of phantom units, performance units or other equity-based awards pursuant to the Partnership&#146;s incentive equity plan, (E)&nbsp;the issuance of Units to maintain the
General Partner&#146;s 2.0% general partner interest in the Partnership; (F)&nbsp;the issuance of any Common Units or general partner interests to Marathon Petroleum Corporation or any of its subsidiaries (<I>provided</I> that neither Marathon
Petroleum Corporation nor any of its subsidiaries shall undertake any transaction with respect to such Common Units or general partner interests described in clause&nbsp;(i) or (ii) above); and (G)&nbsp;the issuance and the registration of the offer
or sale of Common Units issued to The Energy &amp; Minerals Group, or any affiliates thereof, pursuant to the EMG Registration Rights Agreement.&nbsp;Any lock-up provisions relating to a Principal Transaction shall be set forth in the applicable
Terms Agreement.&nbsp;&#147;<B>EMG Registration Rights Agreement</B>&#148; means that certain Registration Rights Agreement, dated as of December&nbsp;4, 2015, by and between the Partnership and the Selling Unitholder. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(n) The Partnership will, pursuant to reasonable procedures developed in good faith, retain copies of each Permitted Free
Writing Prospectus that is not filed with the Commission in accordance with Rule&nbsp;433 under the Securities Act. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(o)
The Partnership will use commercially reasonable efforts to cause the Units to be listed on the Exchange. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(p) The
Partnership and the Selling Unitholder consent to each Agent trading in the Common Units for such Agent&#146;s own account and for the account of its clients at the same time as sales of the Units occur pursuant to this Agreement or any Terms
Agreement. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(q) If immediately prior to the third anniversary (the &#147;<B>Renewal Deadline</B>&#148;) of the initial
effective date of the Registration Statements, the aggregate Gross Sales Price of Units sold under this Agreement is substantially less than the Maximum Amount and this Agreement has not expired or been terminated, the Partnership may, prior to the
Renewal Deadline, file, if it has not already done so and is eligible to do so, a new automatic shelf registration statement relating to the Units, in a form satisfactory to the Agents.&nbsp;If the Partnership is no longer eligible to file an
automatic shelf registration statement, the Partnership may, prior to the Renewal Deadline, if it has not already done so, file a new shelf registration statement relating to the Units, in a form satisfactory to the Agents; <I>provided</I> that if
the Partnership does not intend to file such a new registration statement, it will notify the Agents of such intent two business days prior to the Renewal Deadline.&nbsp;References herein to the Registration Statements shall include such new
automatic shelf registration statement or such new shelf registration statement, as the case may be. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">6. <U>Execution of
Agreement</U>.&nbsp;Each Agent&#146;s obligations under this Agreement shall be subject to the satisfaction of the following conditions in connection with and on the date of the execution of this Agreement:</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) the Partnership shall have delivered to the Agents: </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 22 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) an officer&#146;s certificate signed by an officer of the Partnership (who
shall be the Chief Financial Officer or other senior financial officer) certifying as to the matters set forth in Exhibit&nbsp;B hereto; </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) an opinion and, if not covered in such opinion, a negative assurance letter of Jones Day, counsel for the Partnership,
addressed to the Agents and dated the date of this Agreement, in form reasonably satisfactory to the Agents; </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) an
opinion of Richards, Layton &amp; Finger, P.A., in the form reasonably satisfactory to the Agents; </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iv) a
&#147;comfort&#148; letter from PricewaterhouseCoopers LLP, addressed to the Agents and dated the date of this Agreement, addressing such matters as the Agents may reasonably request; </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(v) a &#147;comfort&#148; letter from Deloitte &amp; Touche LLP, addressed to the Agents and dated the date of this Agreement,
addressing such matters as the Agents may reasonably request; </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vi) evidence reasonably satisfactory to the Agents and
their counsel that the Units have been approved for listing on the Exchange, subject only to notice of issuance on or before the date hereof; </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vii) resolutions duly adopted by the General Partner&#146;s board of directors or an authorized committee thereof, and
certified by an officer of the General Partner, authorizing the Partnership&#146;s and the General Partner&#146;s execution of this Agreement and the consummation by the Partnership of the transactions contemplated hereby, including the issuance and
sale of the Units; and </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(viii) such other documents as the Agents shall reasonably request. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) The Agents shall have received a letter or letters, which shall include legal opinions and negative assurance statements,
of Latham &amp; Watkins LLP, counsel to the Agents, addressed to the Agents and dated the date of this Agreement, addressing such matters as the Agents may reasonably request. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) the Selling Unitholder shall have delivered to the Agents: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) an officer&#146;s certificate signed by an officer of the Selling Unitholder (who shall be the Chief Financial Officer or
other senior financial officer) certifying as to the matters set forth in Exhibit&nbsp;C hereto; </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) an opinion letter of
Locke Lord LLP, counsel for the Selling Unitholder, addressed to the Agents and dated the date of this Agreement, in form reasonably satisfactory to the Agents; and </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) such other documents as the Agents shall reasonably request. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">7. <U>Additional Covenants of the Partnership</U>.&nbsp;The Partnership further covenants and agrees with each Agent as follows:</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) Each Transaction Proposal made by the Partnership or Custodian that is accepted by an Agent by means of a Transaction
Acceptance and each execution and delivery by the Partnership of a Terms Agreement shall be deemed to be (i)&nbsp;an affirmation that the representations, warranties and agreements of the Partnership and Selling Unitholder herein contained and
contained in any certificate delivered to the Agents pursuant hereto are true and correct at such Time of Acceptance or the date of such Terms Agreement, as the case may be, and (ii)&nbsp;an undertaking that such representations, warranties and
agreements will be true and correct on any applicable Time of Sale and Settlement Date, as though made at and as of each such time (it being understood that such representations, warranties and agreements shall relate to the Registration Statements,
the Prospectus or any Permitted Free Writing Prospectus as amended </P>
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and supplemented to the time of such Transaction Acceptance or Terms Agreement as the case may be); it being further understood that such representations, warranties and agreements incorporate
any modifications to the representations, warranties and agreements set forth in Sections&nbsp;3(d), 3(e), 3(i) through (q), and 3(ff) hereof that have arisen in the ordinary course of business and as otherwise would not be reasonably likely to
result in a Material Adverse Effect, <I>provided</I> that the Partnership shall have provided, or caused to be provided, information relating to such modifications to each of the Agents, or their agents, as part of the due diligence provided for
under this Agreement. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Subject to the last sentence of this Section&nbsp;7(b), each time that (i)&nbsp;the Registration
Statements, the Prospectus or any Permitted Free Writing Prospectus shall be amended or supplemented (including, except as noted in the proviso at the end of this Section&nbsp;7(b), by the filing of any Incorporated Document), (ii)&nbsp;there is a
Principal Settlement Date pursuant to a Terms Agreement, or (iii)&nbsp;the Agents shall reasonably request (each date referred to clauses&nbsp;(i), (ii) and (iii) above, a &#147;<B>Bring-Down Delivery Date</B>&#148;), the Partnership and the Selling
Unitholder shall, unless the Agents agree otherwise, furnish or cause to be furnished to the Agents certificates, dated as of such Bring-Down Delivery Date and delivered within one Exchange Business Day after the applicable Bring-Down Delivery Date
or, in the case of a Bring-Down Delivery Date resulting from a Principal Settlement Date, delivered on such Principal Settlement Date, of the same tenor as the certificates referred to in Section&nbsp;6(a)(i) and Section 6(c)(i), respectively,
modified as necessary to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the time of delivery of such certificate as the Agents may reasonably request, or, in lieu of such
certificate, a certificate to the effect that the statements contained in the certificate referred to in Section&nbsp;6(a)(i) and Section 6(c)(i) hereof furnished to Agents is true and correct as of such Bring-Down Delivery Date as though made at
and as of such date (except that (i)&nbsp;such statements shall be deemed to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the time of delivery of such certificate and
(ii)&nbsp;such statements shall be deemed to relate to the representations, warranties and agreements set forth in Sections&nbsp;3(d), 3(e), 3(i) through (q), and 3(ff) hereof with respect to the Partnership and Section 4 with respect to the Selling
Unitholder, as modified to incorporate any changes that have arisen in the ordinary course of business and as otherwise would not be reasonably likely to result in a Material Adverse Effect, <I>provided</I> that the Partnership and the Selling
Unitholder, as applicable, shall have provided, or caused to be provided, information relating to such modifications to each of the Agents, or their agents, as part of the due diligence provided for under this Agreement); <I>provided</I>,
<I>however</I>, that the filing of a Current Report on Form&nbsp;8-K will not constitute a Bring-Down Delivery Date under clause&nbsp;(i) above unless either (A)(x)&nbsp;such Current Report on Form&nbsp;8-K is filed at any time during which either a
Transaction Acceptance is binding and the Partnership has not suspended the use thereof (and prior to the settlement of the Units specified therein) or a prospectus relating to the Units is required to be delivered under the Securities Act (whether
physically or through compliance with Rule&nbsp;172 under the Securities Act or any similar rule) or such Current Report on Form&nbsp;8-K is filed at any time from and including the date of a Terms Agreement through and including the related
Settlement Date and (y)&nbsp;the Agents have reasonably requested that such date be deemed to be a Bring-Down Delivery Date based upon the event or events reported in such Current Report on Form&nbsp;8-K or (B)&nbsp;such Current Report on
Form&nbsp;8-K contains capsule financial information, historical or pro forma financial statements, supporting schedules or other financial data, including any Current Report on Form&nbsp;8-K or part thereof under Item&nbsp;2.02 of
Regulation&nbsp;S-K of the Commission that is considered &#147;filed&#148; under the Exchange Act; and <I>provided</I>, <I>further</I>, that an amendment or supplement to the Registration Statements or the Prospectus relating to the offering of
other securities pursuant to the Registration Statements will not constitute a Bring-Down Delivery Date.&nbsp;Notwithstanding the foregoing, the Partnership shall not be obligated to deliver any certificates or other documents pursuant to this
Section&nbsp;7(b) unless and until such time as the Partnership delivers a Transaction Proposal or offers to enter into a Terms Agreement, or the requirements of this Section&nbsp;7(b) are triggered on any Purchase Date. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) Subject to the last sentence of this Section&nbsp;7(c), on each Bring-Down Delivery Date, (i) the Partnership shall, unless
the Agents agree otherwise, cause to be furnished to Agents the written opinion and, if not included in such opinion, negative assurance letter of Jones Day, counsel to the Partnership, and the written opinion of Richards, Layton &amp; Finger, P.A.,
counsel to the Partnership, each dated as of the applicable Bring-Down Delivery Date and delivered within one Exchange Business Day after the applicable Bring-Down Delivery Date or, in the case of a Bring-Down Delivery Date resulting
</P>
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from a Principal Settlement Date, dated and delivered on such Principal Settlement Date, of the same tenor as the opinions and letters referred to in Section&nbsp;6(a)(ii) and
Section&nbsp;6(a)(iii) hereof, as applicable, but modified as necessary to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the time of delivery of such opinions and
letters (ii) the Selling Unitholder&nbsp;shall, unless the Agents agree otherwise, cause to be furnished to Agents the written opinion of Locke Lord LLP, counsel to the Selling Unitholder, dated as of the applicable Bring-Down Delivery Date and
delivered within one Exchange Business Day after the applicable Bring-Down Delivery Date or, in the case of a Bring-Down Delivery Date resulting from a Principal Settlement Date, dated and delivered on such Principal Settlement Date, of the same
tenor as the opinions and letters referred to in Section&nbsp;6(c)(ii) hereof, but modified as necessary to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the time of
delivery of such opinions and letters, or (iii) in lieu of such opinions and letters, each such counsel shall furnish the Agents with a letter substantially to the effect that the Agents may rely on the opinion and letter of such counsel referred to
in Section&nbsp;6(a)(ii), Section&nbsp;6(a)(iii) and Section 6(c)(ii), as applicable, furnished to the Agents, to the same extent as though they were dated the date of such letter authorizing reliance (except that statements in such last opinion and
letter of such counsel shall be deemed to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the time of delivery of such letters authorizing reliance).&nbsp;Notwithstanding
the foregoing, the Partnership and the Selling Unitholder shall not be obligated to cause to be furnished any opinions or other documents pursuant to this Section&nbsp;7(c) unless and until such time as the Partnership or the Custodian delivers a
Transaction Proposal or offers to enter into a Terms Agreement, or the requirements of this Section&nbsp;7(c) are triggered on any Purchase Date. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) Subject to the last sentence of this Section&nbsp;7(d), on each Bring-Down Delivery Date, the Partnership shall, unless the
Agents agree otherwise, cause each of PricewaterhouseCoopers LLP and Deloitte &amp; Touche LLP to furnish to the Agents a &#147;comfort&#148; letter, dated as of the applicable Bring-Down Delivery Date and delivered within one Exchange Business Day
after the applicable Bring-Down Delivery Date or, in the case of a Bring-Down Delivery Date resulting from a Principal Settlement Date, delivered on such Principal Settlement Date, of the same tenor as the letter referred to in Section&nbsp;6(a)(iv)
hereof, but modified to relate to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus as amended and supplemented to the date of such letter, and, if the Registration Statements, the Prospectus or any Permitted Free
Writing Prospectus shall include or incorporate by reference the financial statements of any entity or business (other than the consolidated financial statements of the Partnership and its subsidiaries), the Partnership shall, if requested by the
Agents, cause a firm of independent public accountants to furnish to the Agents a &#147;comfort&#148; letter, dated as of the applicable Bring-Down Delivery Date and delivered within one Exchange Business Day after the applicable Bring-Down Delivery
Date or, in the case of a Bring-Down Delivery Date resulting from a Principal Settlement Date, delivered on such Principal Settlement Date, addressing such matters as the Agents may reasonably request. Notwithstanding the foregoing, the Partnership
shall not be obligated to cause to be furnished any &#147;comfort&#148; letters or other documents pursuant to this Section&nbsp;7(d) unless and until such time as the Partnership delivers a Transaction Proposal or offers to enter into a Terms
Agreement, or the requirements of this Section&nbsp;7(d) are triggered on any Purchase Date. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) (i)&nbsp;No order
suspending the effectiveness of the Registration Statements shall be in effect, and no proceeding for such purpose or pursuant to Section&nbsp;8A under the Securities Act shall be pending before or threatened by the Commission; the Prospectus and
each Permitted Free Writing Prospectus shall have been filed with the Commission under the Securities Act (in the case of a Permitted Free Writing Prospectus, to the extent required by Rule&nbsp;433 under the Securities Act); and all requests by the
Commission for additional information shall have been complied with to the reasonable satisfaction of the Agents and no suspension of the qualification of the Units for offering or sale in any jurisdiction, or of the initiation or threatening of any
proceedings for any of such purposes, shall have occurred and be in effect at the time the Partnership delivers a Transaction Proposal to an Agent or the time an Agent delivers a Transaction Acceptance to the Partnership; and (ii)&nbsp;the
Registration Statements, the Prospectus or any Permitted Free Writing Prospectus shall not contain an untrue statement of material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in
the light of the circumstances under which they were made, not misleading at the time the Partnership delivers a </P>
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Transaction Proposal to an Agent or the time an Agent delivers a Transaction Acceptance to the Partnership. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The Partnership, the General Partner and the Selling Unitholder shall reasonably cooperate with any reasonable due
diligence review requested by the Agents or their counsel from time to time in connection with the transactions contemplated hereby or any Terms Agreement, including, without limitation, (i)&nbsp;at the commencement of each intended Purchase Date
and any Time of Sale or Settlement Date, providing information and making available appropriate documents and appropriate corporate officers of the Partnership and, upon reasonable request, representatives of each of PricewaterhouseCoopers LLP and
Deloitte &amp; Touche LLP (and, if the Registration Statements or the Prospectus shall include or incorporate by reference the financial statements of any entity or business (other than the consolidated financial statements of the Partnership and
its subsidiaries), representatives of the independent public accountants that audited or reviewed such financial statements) for an update on diligence matters with representatives of the Agents and (ii)&nbsp;at each Bring-Down Delivery Date and
otherwise as the Agents may reasonably request, providing information and making available documents and appropriate corporate officers of the Partnership and the General Partner and representatives of each of PricewaterhouseCoopers LLP and Deloitte
&amp; Touche LLP (and, if the Registration Statements, or the Prospectus shall include or incorporate by reference the financial statements of any entity or business (other than the consolidated financial statements of the Partnership and its
subsidiaries), representatives of the independent public accountants that audited or reviewed such financial statements) for one or more due diligence sessions with representatives of the Agents and their counsel (<I>provided</I>, <I>however</I>,
that the Partnership shall have no obligations under this clause&nbsp;(ii) unless and until such time as the Partnership delivers a Transaction Proposal or offers to enter into a Terms Agreement, or the requirements of this clause&nbsp;(ii) are
triggered on any Purchase Date). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) The Partnership shall disclose, in its quarterly reports on Form&nbsp;10-Q and in its
annual report on Form&nbsp;10-K and, if reasonably requested by the Agents, in supplements to the Prospectus to be filed by the Partnership with the Commission from time to time, the number of the Primary Units sold through the Agents under this
Agreement and any Terms Agreement, and the net proceeds to the Partnership from the sale of the Primary Units with respect to sales of the Units pursuant to this Agreement during the relevant quarter or, in the case of any such prospectus
supplement, such shorter period as the Agents may reasonably request or, in the case of an Annual Report on Form&nbsp;10-K, during the fiscal year covered by such Annual Report and the fourth quarter of such fiscal year. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">All opinions, letters and other documents referred to in Sections&nbsp;7(a) through (d) above shall be reasonably satisfactory in form and
substance to the Agents.&nbsp;The Agents will provide the Partnership and Selling Unitholder with such notice (which may be oral, and in such case, will be confirmed via e-mail as soon as reasonably practicable thereafter) as is reasonably
practicable under the circumstances when requesting an opinion, letter or other document referred to in Sections&nbsp;7(a) through (d) above. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">8. <U>Conditions of the Agents&#146; Obligations</U>.&nbsp;Each Agent&#146;s obligation to solicit purchases on an agency basis for the Units
or otherwise take any action pursuant to a Transaction Acceptance and to purchase the Units pursuant to any Terms Agreement shall be subject to the satisfaction of the following conditions.&nbsp;For the avoidance of doubt, the failure of the Selling
Unitholder to deliver, or cause to be delivered, any required certificates or opinions called for in this Agreement shall not prevent the Partnership from issuing Primary Units pursuant to this Agreement. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) At the Time of Acceptance, at the time of the commencement of trading on the Exchange on the Purchase Date(s) and at the
relevant Time of Sale and Agency Settlement Date, or with respect to a Principal Transaction pursuant to a Terms Agreement, at the time of execution and delivery of the Terms Agreement by the Partnership, Custodian and Selling Unitholder, as
applicable, and at the relevant Time of Sale and Principal Settlement Date:</P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(i) The representations, warranties and
agreements on the part of the Partnership and the General Partner herein contained or contained in any certificate of an officer or officers, general partner, managing member or other authorized representative of the Partnership and the General
Partner or any subsidiary of the Partnership and the General Partner delivered pursuant to </P>
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the provisions hereof shall be true and correct in all respects; it being further understood that such representations, warranties and agreements incorporate any modifications to the
representations, warranties and agreements set forth in Sections&nbsp;3(d), 3(e), 3(i) through (q), and 3(ff) hereof that have arisen in the ordinary course of business and as otherwise would not be reasonably likely to result in a Material Adverse
Effect, <I>provided</I> that the Partnership shall have provided, or caused to be provided, information relating to such modifications to each of the Agents, or their agents, as part of the due diligence provided for under this Agreement. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) The representations, warranties and agreements on the part of the Selling Unitholder herein contained or contained in any
certificate of an officer or officers, general partner, managing member or other authorized representative of the Selling Unitholder delivered pursuant to the provisions hereof shall be true and correct in all respects; it being further understood
that such representations, warranties and agreements incorporate any modifications to the representations, warranties and agreements set forth in Section 4 hereof that have arisen in the ordinary course of business and as otherwise would not be
reasonably likely to result in a Material Adverse Effect, <I>provided</I> that the Selling Unitholder shall have provided, or caused to be provided, information relating to such modifications to each of the Agents, or their agents, as part of the
due diligence provided for under this Agreement. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) Each of the Partnership and the General Partner and Selling
Unitholder shall have performed and observed its respective covenants and other obligations hereunder and/or under any Terms Agreement, as the case may be, in all material respects. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iv) In the case of an Agency Transaction, from the Time of Acceptance until the Agency Settlement Date, or, in the case of a
Principal Transaction pursuant to a Terms Agreement, from the time of execution and delivery of the Terms Agreement by the Partnership, Custodian and Selling Unitholder, as applicable,&nbsp;until the Principal Settlement Date, trading in the Common
Units on the Exchange shall not have been suspended. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(v) From the date of this Agreement, no event or condition of a type
described in Section&nbsp;3(nn) hereof shall have occurred or shall exist, which event or condition is not described in the Prospectus and the effect of which in the judgment of the Agents makes it impracticable or inadvisable to proceed with the
offering, sale or delivery of the Units on the applicable Settlement Date on the terms and in the manner contemplated by this Agreement, any Terms Agreement, any Permitted Free Writing Prospectus and the Prospectus. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vi) Subsequent to the relevant Time of Acceptance or, in the case of a Principal Transaction, subsequent to execution of the
applicable Terms Agreement, (A)&nbsp;no downgrading shall have occurred in the rating accorded any debt securities or preferred equity securities of or guaranteed by the Partnership or any of its subsidiaries by any &#147;nationally recognized
statistical rating organization&#148;, as such term is defined by the Commission for purposes of Section&nbsp;3(a)(62) of the Exchange Act and (B)&nbsp;no such organization shall have publicly announced that it has under surveillance or review, or
has changed its outlook with respect to, its rating of any debt securities or preferred equity securities of or guaranteed by the Partnership or any of its subsidiaries (other than an announcement with positive implications of a possible upgrading)
in each case that has not been described in the Prospectus prior to any related Time of Sale. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(vii) The Primary Units to
be issued pursuant to the Transaction Acceptance or pursuant to a Terms Agreement, as applicable, shall have been approved for listing on the Exchange, subject only to notice of issuance. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(viii) (A)&nbsp;No action shall have been taken and no statute, rule, regulation or order shall have been enacted, adopted or
issued by any federal, state or foreign governmental or regulatory authority that would, as of the relevant Settlement Date, prevent the issuance or sale of the Primary Units or sale of the Secondary Units and (B)&nbsp;no injunction or order of any
federal, state or foreign court shall have been issued that would, as of the relevant Settlement Date, prevent the issuance or sale of the Primary Units or sale of the Secondary Units. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 27 - </P>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ix) (A)&nbsp;No order suspending the effectiveness of the Partnership
Registration Statement or Selling Unitholder Registration Statement, as applicable, shall be in effect, no proceeding for such purpose or pursuant to Section&nbsp;8A of the Securities Act shall be pending before or threatened by the Commission and
no notice of objection of the Commission to the use of the Partnership Registration Statement or Selling Unitholder Registration Statement, as applicable, pursuant to Rule&nbsp;401(g) under the Securities Act shall have been received by the
Partnership; (B)&nbsp;the Prospectus and each Permitted Free Writing Prospectus shall have been filed with the Commission under the Securities Act (in the case of any Permitted Free Writing Prospectus, to the extent required by Rule&nbsp;433 under
the Securities Act); (C)&nbsp;all requests by the Commission for additional information shall have been complied with to the satisfaction of the Agents; and (D)&nbsp;no suspension of the qualification of the Units for offering or sale in any
jurisdiction, and no initiation or threatening of any proceedings for any of such purposes, shall have occurred and be in effect.&nbsp;The Registration Statements, the Prospectus or any Permitted Free Writing Prospectus shall not contain an untrue
statement of material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading at the time an Agent delivers a
Transaction Acceptance to the Partnership and Custodian or the Partnership or Custodian and an Agent execute a Terms Agreement, as the case may be. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(x) No amendment or supplement to the Registration Statements, the Prospectus or any Permitted Free Writing Prospectus shall
have been filed to which the Agents shall have reasonably objected in writing. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Within one Exchange Business Day after
the applicable Bring-Down Delivery Date or, in the case of a Bring-Down Delivery Date resulting from a Principal Settlement Date, on such Principal Settlement Date, the Agents shall have received the officer&#146;s certificates, opinions and
negative assurance letters of counsel and &#147;comfort&#148; letters and other documents required under Sections&nbsp;7(a) through (d), inclusive.&nbsp;For purposes of clarity and without limitation to any other provision of this Section&nbsp;8 or
elsewhere in this Agreement, the parties hereto agree that the Agents&#146; obligations, if any, to solicit purchases of Units on an agency basis or otherwise take any action pursuant to a Transaction Acceptance shall, unless otherwise agreed in
writing by the Agents, be suspended during the period from and including a Bring-Down Delivery Date through and including the time that the Agents shall have received the documents described in the preceding sentence. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">9. <U>Termination</U>.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) (i) The Partnership may terminate this Agreement in its sole discretion at any time upon prior written notice to the
Agents. Any such termination shall be without liability of any party to any other party, except that (A) with respect to any pending sale of Primary Units, the obligations of the Partnership, including in respect of compensation of the applicable
Agent with respect to the Primary Units, shall remain in full force and effect notwithstanding such termination; and (B)&nbsp;the provisions of Sections&nbsp;3, 5(a), 5(d) through 5(g), 5(i), 5(k), 5(l), 5(n) through 5(p), 5(q), 10, 13, 14 and 16 of
this Agreement shall remain in full force and effect notwithstanding such termination (except that if no Primary Units have been previously sold hereunder or under any Terms Agreement, the only provision of Section&nbsp;5 that will survive
termination is Section&nbsp;5(k)). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) The Selling Unitholder may terminate this Agreement as it relates to the offering
of Secondary Units in its sole discretion at any time upon prior written notice to the Agents.&nbsp;Any such termination shall be without liability of any party to any other party, except that (A)&nbsp;with respect to any pending sale of Secondary
Units, the obligations of the Selling Unitholder, including in respect of compensation of the applicable Agent with respect to the Secondary Units, shall remain in full force and effect notwithstanding such termination; and (B)&nbsp;the provisions
of Sections&nbsp;3, 5(a), 5(d) through 5(g), 5(i), 5(k), 5(l), 5(n) through 5(p), 5(q), 10, 13, 14 and 16 of this Agreement with respect to the Secondary Units, shall remain in full force and effect notwithstanding such termination to the extent
that such provisions are applicable to the Selling Unitholder (except that if no Secondary Units have been previously sold hereunder or under any Terms Agreement, the only provision of Section&nbsp;5 that will survive termination is
Section&nbsp;5(k)). </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(iii) In the case of any sale by the Partnership, Custodian or the Selling
Unitholder pursuant to a Terms Agreement, the obligations of the Partnership and/or the Selling Unitholder pursuant to such Terms Agreement and this Agreement may not be terminated by the Partnership or the Selling Unitholder without the prior
written consent of the applicable Agent. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) (i)&nbsp;Each Agent may terminate its own obligations under the provisions of
this Agreement relating to the solicitation of offers to purchase Units in its sole discretion at any time upon giving prior written notice to the Partnership and Custodian; <I>provided</I>, <I>however</I>, that this Agreement and the obligations
hereunder will remain in full force and effect with respect to the Agents that have not so terminated their obligations. Any such termination shall be without liability of any party to any other party, except that the provisions of Sections&nbsp;3,
5(a), 5(d) through 5(g), 5(i), 5(k), 5(l), 5(n) through 5(p), 5(q), 10, 13, 14 and 16 of this Agreement shall remain in full force and effect notwithstanding such termination (except that if no Units have been previously sold hereunder or under any
Terms Agreement, the only provision of Section&nbsp;5 that will survive termination is Section&nbsp;5(k)). </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:8%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(ii) In the
case of any purchase by an Agent pursuant to a Terms Agreement, the obligations of such Agent pursuant to such Terms Agreement shall be subject to termination by such Agent at any time prior to or at the Principal Settlement Date if (A) since the
time of execution of the Terms Agreement or the respective dates as of which information is given in the Registration Statements, the Prospectus and any Permitted Free Writing Prospectus, (i)&nbsp;trading generally shall have been suspended or
materially limited on or by any of the New York Stock Exchange, the Nasdaq Stock Market, the Chicago Board Options Exchange, the Chicago Mercantile Exchange or the Chicago Board of Trade; (ii)&nbsp;trading of any securities issued or guaranteed by
any MPLX Entity shall have been suspended on any exchange or in any over-the counter market, (iii)&nbsp;a general moratorium on commercial banking activities shall have been declared by federal or New York state authorities, (iv)&nbsp;there shall
have occurred any outbreak or escalation of hostilities or any change in financial markets or any calamity or crisis, either within or outside the United States, that, solely in the case of events and conditions described in this clause&nbsp;(iv),
in such Agent&#146;s judgment, is material and adverse and makes it impracticable or inadvisable to proceed with the offering, sale or delivery of the Units on the terms and in the manner contemplated in the Prospectus or such Terms Agreement. If
such Agent elects to terminate its obligations pursuant to this Section&nbsp;9(b)(ii), the Partnership and Custodian shall be notified promptly in writing. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) This Agreement shall remain in full force and effect until the earliest of (A)&nbsp;termination of the Agreement pursuant
to Section&nbsp;9(a) or 9(b) above or otherwise by mutual written agreement of the parties and (B)&nbsp;such date that aggregate Gross Sales Price of the Primary Units sold in accordance with the terms of this Agreement and any Terms Agreement
equals the Maximum Amount, in each case except that the provisions of Section&nbsp;3, 5(a), 5(d) through 5(g), 5(i), 5(k), 5(l), 5(n) through 5(p), 5(q), 10, 13, 14 and 16 of this Agreement shall remain in full force and effect notwithstanding such
termination (except that if no Units have been previously sold hereunder or under any Terms Agreement, the only provision of Section&nbsp;5 that will survive termination is Section&nbsp;5(k)). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) Any termination of this Agreement shall be effective on the date specified in such notice of termination; <I>provided</I>
that, notwithstanding the foregoing, such termination shall not be effective until the close of business on the date of receipt of such notice by the Agents, the Partnership or the Custodian, as the case may be, or such later date as may be required
pursuant to Section&nbsp;9(a) or 9(b).&nbsp;If such termination shall occur prior to the Settlement Date for any sale of Units, such sale shall settle in accordance with the provisions of Section&nbsp;2 hereof. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">10. <U>Indemnity and Contribution</U>.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) The Partnership and the General Partner agree to indemnify and hold harmless each Agent, its affiliates, and each of their
respective directors and officers and each person, if any, who controls such Agent within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act, from and against any and all losses, claims, damages and
liabilities (including, without limitation, reasonable out of pocket legal fees and other expenses incurred in connection with any suit, action or proceeding or any </P>
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claim asserted, as such fees and expenses are incurred), that arise out of, or are based upon, (i)&nbsp;any untrue statement or alleged untrue statement of a material fact contained in the
Registration Statements (or any amendment thereto) or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary in order to make the statements therein, not misleading or (ii)&nbsp;any
untrue statement or alleged untrue statement of a material fact contained in the Prospectus (or any amendment or supplement thereto), any Permitted Free Writing Prospectus (or any amendment or supplement thereto) or any &#147;issuer
information&#148; filed or required to be filed pursuant to Rule&nbsp;433(d) under the Securities Act, or caused by any omission or alleged omission to state therein a material fact necessary in order to make the statements therein, in light of the
circumstances under which they were made, not misleading, in each case except insofar as such losses, claims, damages or liabilities arise out of, or are based upon, any untrue statement or omission or alleged untrue statement or omission made in
reliance upon and in conformity with any information relating to the Agents or the Selling Unitholder furnished to the Partnership in writing by the Agents or the Selling Unitholder expressly for use therein, it being understood and agreed that the
only such information furnished by the Agents consists of the information described as such in subsection&nbsp;(b) below. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) Each Agent agrees, severally and not jointly, to indemnify and hold harmless (i) the Partnership, its directors, its
officers who signed the Registration Statements and each person, if any, who controls the Partnership within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act and (ii) the Selling Unitholder, its directors,
its officers and each person, if any, who controls the Partnership within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act, in each case to the same extent as the indemnity set forth in paragraph&nbsp;(a)
above, but only with respect to any losses, claims, damages or liabilities that arise out of, or are based upon, any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with any information
relating to the Agents furnished to the Partnership or Selling Unitholder in writing by the Agents expressly for use in the Registration Statements (or any amendment thereto), the Prospectus (or any amendment or supplement thereto) or any Permitted
Free Writing Prospectus (or any amendment or supplement thereto), it being understood and agreed upon that such information shall consist solely of the following: the information appearing in the last sentence of the second paragraph under the
caption &#147;Plan of Distribution (Conflicts of Interest)&#148; in the Prospectus Supplement. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(c) The Selling Unitholder
agrees to indemnify and hold harmless (i) the Partnership, its directors, its officers who signed the Registration Statements and each person, if any, who controls the Partnership within the meaning of Section&nbsp;15 of the Securities Act or
Section&nbsp;20 of the Exchange Act and (ii) each Agent, its directors, its officers and each person, if any, who controls each Agent within the meaning of Section&nbsp;15 of the Securities Act or Section&nbsp;20 of the Exchange Act, in each case to
the same extent as the indemnity set forth in paragraph&nbsp;(a) above, but only with respect to any losses, claims, damages or liabilities that arise out of, or are based upon, any untrue statement or omission or alleged untrue statement or
omission made in reliance upon and in conformity with any information relating to the Selling Unitholder furnished to the Partnership in writing by the Selling Unitholder expressly for use in the Registration Statements (or any amendment thereto),
the Prospectus (or any amendment or supplement thereto) or any Permitted Free Writing Prospectus (or any amendment or supplement thereto). </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(d) If any suit, action, proceeding (including any governmental or regulatory investigation), claim or demand shall be brought
or asserted against any person in respect of which indemnification may be sought pursuant to either Section&nbsp;10(a), 10(b) or 10(c) above, such person (the &#147;<B>Indemnified Person</B>&#148;) shall promptly notify the person against whom such
indemnification may be sought (the &#147;<B>Indemnifying Person</B>&#148;) in writing.&nbsp;If any such proceeding shall be brought or asserted against an Indemnified Person and it shall have notified the Indemnifying Person thereof, the
Indemnifying Person shall retain counsel reasonably satisfactory to the Indemnified Person (who shall not, without the consent of the Indemnified Person, be counsel to the Indemnifying Person) to represent the Indemnified Person and any others
entitled to indemnification pursuant to this Section&nbsp;10 that the Indemnifying Person may designate in such proceeding and shall pay the fees and expenses of such counsel related to such proceeding, as incurred.&nbsp;In any such proceeding, any
Indemnified Person shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such Indemnified Person unless (i)&nbsp;the Indemnifying Person and the Indemnified Person shall have mutually
agreed to the contrary or (ii)&nbsp;the named parties in </P>
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any such proceeding (including any impleaded parties) included both the Indemnifying Person and the Indemnified Person and representation of both parties by the same counsel would be
inappropriate due to actual or potential differing interests between them. It is understood and agreed that the Indemnifying Person shall not, in connection with any proceeding or related proceeding in the same jurisdiction, be liable for the
reasonable fees and expenses of more than one separate firm (in addition to any local counsel) for (A)&nbsp;the Agents and their affiliates, directors and officers and their control persons, if any, (B)&nbsp;the Partnership, its directors, its
officers who signed the Registration Statements and its control persons, if any, and (C)&nbsp;the Selling Unitholder, its directors, its officers and its control persons, if any, as the case may be, and that all such reasonable fees and expenses
shall be paid or reimbursed as they are incurred. Any such separate firm for the Agents and their affiliates, directors and officers and their control persons, if any, shall be designated in writing by the Agents, and any such separate firm for the
Partnership, its directors, its officers who signed the Registration Statements and its control persons, if any, shall be designated in writing by the Partnership. The Indemnifying Person shall not be liable for any settlement of any proceeding
effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the Indemnifying Person agrees to indemnify each Indemnified Person from and against any loss or liability by reason of such
settlement or judgment. No Indemnifying Person shall be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the Indemnifying Person
agrees to indemnify the Indemnified Person from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an Indemnified Person shall have requested an Indemnifying Person to
reimburse the Indemnified Person for fees and expenses of counsel as contemplated by the second sentence of this Section&nbsp;10(c), then the Indemnifying Person agrees that it shall be liable for any settlement of any Proceeding effected without
its written consent if (i)&nbsp;such settlement is entered into more than 60&nbsp;business days after receipt by such Indemnifying Person of the aforesaid request, (ii)&nbsp;such Indemnifying Person shall not have fully reimbursed the Indemnified
Person in accordance with such request prior to the date of such settlement and (iii)&nbsp;such Indemnified Person shall have given the Indemnifying Person at least 30&nbsp;days&#146; prior notice of its intention to settle. No Indemnifying Person
shall, without the prior written consent of the Indemnified Person, effect any settlement of any pending or threatened proceeding in respect of which any Indemnified Person is or could have been a party and indemnity could have been sought hereunder
by such Indemnified Person, unless such settlement (i)&nbsp;includes an unconditional release of such Indemnified Person from all liability on claims that are the subject matter of such proceeding and (ii)&nbsp;does not include a statement as to or
an admission of fault, culpability or failure to act, by or on behalf of any Indemnified Person. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(e) If the
indemnification provided for in Sections&nbsp;10(a), 10(b) or 10(c) above is unavailable to an Indemnified Person or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each Indemnifying Person under such
Sections, in lieu of indemnifying such Indemnified Person thereunder, shall contribute to the amount paid or payable by such Indemnified Person as a result of such losses, claims, damages or liabilities (i)&nbsp;in such proportion as is appropriate
to reflect the relative benefits received by the Partnership, on the one hand, and the applicable Agents, on the other, from the offering of the Units pursuant to this Agreement and any Terms Agreements or (ii)&nbsp;if the allocation provided by
clause&nbsp;(i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause&nbsp;(i) but also the relative fault of the Partnership and Selling Unitholder, on the one hand,
and the applicable Agents, on the other, in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative benefits received by the
Partnership and Selling Unitholder, on the one hand, and the applicable Agents, on the other, shall be deemed to be in the same respective proportions as the net proceeds (before deducting expenses) received by the Partnership and Selling Unitholder
from the sale of the Units pursuant to this Agreement and any Terms Agreements and the total discounts and commissions received by the applicable Agents in connection therewith bear to the aggregate Gross Sales Price of such Units. The relative
fault of the Partnership and Selling Unitholder, on the one hand, and the applicable Agents, on the other, shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the Partnership or Selling Unitholder, on the one hand, or by the applicable Agents, on the other hand, and the parties&#146; relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 31 - </P>


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<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(f) The Partnership, Selling Unitholder and the Agents agree that it would not be
just and equitable if contribution pursuant to this Section&nbsp;10 were determined by <U>pro</U> <U>rata</U> allocation or by any other method of allocation that does not take account of the equitable considerations referred to in
Section&nbsp;10(d) above.&nbsp;The amount paid or payable by an Indemnified Person as a result of the losses, claims, damages and liabilities referred to in Section&nbsp;10(d) above shall be deemed to include, subject to the limitations set forth
above, any legal or other expenses incurred by such Indemnified Person in connection with any such action or claim. Notwithstanding the provisions of this Section&nbsp;10, in no event shall an Agent be required to contribute any amount in excess of
the amount by which the total discounts and commissions received by such Agent with respect to the offering of the Units pursuant to this Agreement and any Terms Agreements exceeds the amount of any damages that such Agent has otherwise been
required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission.&nbsp;No person guilty of fraudulent misrepresentation (within the meaning of Section&nbsp;11(f) of the Securities Act) shall be entitled to
contribution from any person who was not guilty of such fraudulent misrepresentation. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(g) The remedies provided for in
this Section&nbsp;10 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any Indemnified Person at law or in equity. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">11. <U>Notices</U>.&nbsp;All notices and other communications under this Agreement and any Terms Agreement shall be in writing and shall be
deemed to have been duly given if mailed or transmitted and confirmed by any standard form of communication, and, if to J.P. Morgan Securities LLC, shall be sufficient in all respects if delivered or sent to J.P. Morgan Securities LLC,
383&nbsp;Madison Avenue, 7th&nbsp;Floor, New York, New York 10179, Attention:&nbsp;Special Equities Group, Adam Rosenbluth (email adam.s.rosenbluth@jpmorgan.com) or Brett Chalmers (email brett.chalmers@jpmorgan.com); Merrill Lynch, Pierce, Fenner
&amp; Smith Incorporated, One Bryant Park, New York, NY 10036, Attention:&nbsp;Thomas Opladen with copies to ECM Legal (fax:&nbsp;(212) 449-0355) with a copy to ECM Legal (fax:&nbsp;(212) 230-8730); Citigroup Global Markets Inc., 388&nbsp;Greenwich
Street, New York, NY 10013, Attention:&nbsp;General Counsel (fax:&nbsp;(646) 291-1469); RBC Capital Markets, LLC, RBC Capital Markets, LLC, 200 Vesey Street,8th Floor, New York, New York 10281-8098, Attn: Equity Syndicate (phone: 877-822-4089;
email: equityprospectus@rbccm.com); Wells Fargo Securities, LLC, 375&nbsp;Park Avenue, New York, NY 10152, Attention:&nbsp;Equity Syndicate Department (fax:&nbsp;(212) 214-5918); and UBS Securities LLC, 1285&nbsp;Avenue of the Americas, New York, NY
10019, Attention:&nbsp;Syndicate, if to the Partnership, shall be sufficient in all respects if delivered or sent to it at MPLX LP, 1515&nbsp;Arapahoe Street, Tower&nbsp;1, Suite&nbsp;1600, Denver, Colorado 80202-2137, Attn:&nbsp;Nancy Buese, with a
copy to MPLX LP, 1515&nbsp;Arapahoe Street, Tower&nbsp;1, Suite&nbsp;1600, Denver, Colorado 80202-2137, Attn:&nbsp;Cory Bromley and, if to the Selling Unitholder, shall be sufficient in all respects if delivered or sent to it to M&amp;R MWE Liberty,
LLC, 2000&nbsp;McKinney Avenue, Suite&nbsp;1200, Dallas, Texas 75201, Attn:&nbsp;John Raymond.&nbsp;Notwithstanding the foregoing, Transaction Proposals shall be delivered by the Partnership, in its own capacity as in its capacity as Custodian for
the Selling Unitholder, and to the Agents, by telephone or email to the applicable Agent as follows:&nbsp;Adam Rosenbluth (email adam.s.rosenbluth@jpmorgan.com) or Brett Chalmers (email brett.chalmers@jpmorgan.com); Merrill Lynch, Pierce, Fenner
&amp; Smith Incorporated, One Bryant Park, New York, NY 10036, Attention:&nbsp;Syndicate Department (fax:&nbsp;(646) 855-3073) with a copy to ECM Legal (fax:&nbsp;(212) 230-8730); Citigroup Global Markets Inc., 388&nbsp;Greenwich Street, New York,
NY 10013, Attention:&nbsp;General Counsel (fax:&nbsp;(646) 291-1469); Morgan Stanley &amp; Co. LLC, 1585&nbsp;Broadway, New York, NY 10026, Attention:&nbsp;Equity Syndicate Desk, with a copy to the Legal Department; Wells Fargo Securities, LLC,
375&nbsp;Park Avenue, New York, NY 10152, Attention:&nbsp;Equity Syndicate Department (fax:&nbsp;(212) 214-5918); and UBS Securities LLC, UBS Securities LLC, 1285&nbsp;Avenue of the Americas, New York, NY 10019, Attention:&nbsp;Syndicate, and
Transaction Acceptances shall be delivered by the Agents to the Partnership by email to Nancy Buese (email nancy.buese@markwest.com) and Josh Hallenbeck (email joshua.hallenbeck@markwest.com). </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">12. <U>No Fiduciary Relationship</U>. The Partnership and the Selling Unitholder acknowledge and agree that each Agent is acting solely in the
capacity of an arm&#146;s length contractual counterparty to the Partnership and the Selling Unitholder with respect to the offering of Units contemplated hereby and any Terms Agreements (including in connection with determining the terms of the
offering) and not as a financial advisor or a fiduciary to, or an agent of, the Partnership or any other person. Additionally, no Agent is advising the Partnership, the Selling Unitholder or any other person as to any legal, tax, investment,
accounting or regulatory matters in any jurisdiction. The Partnership and the Selling Unitholder shall consult with its own advisors concerning such matters and shall be responsible for making its own independent investigation and appraisal of the
transactions contemplated hereby, and no Agent shall have responsibility or liability to the Partnership or the Selling Unitholder with respect thereto.&nbsp;Any </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 32 - </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
review by the Agents of the Partnership or the Selling Unitholder, the transactions contemplated hereby or other matters relating to such transactions will be performed solely for the benefit of
the Agents and shall not be on behalf of the Partnership or the Selling Unitholder. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">13. <U>Governing Law; Construction</U>.</P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(a) This Agreement, any Terms Agreement and any claim, counterclaim or dispute of any kind or nature whatsoever arising out of
or in any way relating to this Agreement or any Terms Agreement (each a &#147;<B>Claim</B>&#148;), directly or indirectly, shall be governed by, and construed in accordance with, the laws of the State of New York without regard to the conflicts of
law principles thereof. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">(b) The section headings in this Agreement and any Terms Agreement have been inserted as a matter
of convenience of reference and are not a part of this Agreement or any Terms Agreement. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">14. <U>Persons Entitled to Benefit of
Agreement</U>.&nbsp;This Agreement and any Terms Agreement shall inure to the benefit of and be binding upon the parties hereto and thereto, respectively, and their respective successors and the officers, directors, affiliates and controlling
persons referred to in Section&nbsp;10 hereof.&nbsp;Nothing in this Agreement or any Terms Agreement is intended or shall be construed to give any other person any legal or equitable right, remedy or claim under or in respect of this Agreement or
any such Terms Agreement or any provision contained herein or therein.&nbsp;No purchaser of Units from or through an Agent shall be deemed to be a successor merely by reason of purchase. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">15. <U>Counterparts</U>.&nbsp;This Agreement and any Terms Agreement may be signed in counterparts (which may include counterparts delivered
by any standard form of telecommunication), each of which shall be an original and all of which together shall constitute one and the same instrument. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">16. <U>Survival</U>.&nbsp;The respective indemnities, rights of contribution, representations, warranties and agreements of the Partnership,
the Selling Unitholder and the Agents contained in this Agreement or any Terms Agreement or made by or on behalf of the Partnership or the Selling Unitholder or the Agents pursuant to this Agreement or any Terms Agreement or any certificate
delivered pursuant hereto or thereto shall survive the delivery of and payment for the Units and shall remain in full force and effect, regardless of any termination of this Agreement or any Terms Agreement or any investigation made by or on behalf
of the Partnership, the Selling Unitholder or the Agents. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">17. <U>Certain Defined Terms</U>.&nbsp;For purposes of this Agreement, except
where otherwise expressly provided, the term &#147;<B>affiliate</B>&#148; has the meaning set forth in Rule&nbsp;405 under Act; the term &#147;<B>business day</B>&#148; means any day other than a day on which banks are permitted or required to be
closed in New York City; and the term &#147;<B>subsidiary</B>&#148; has the meaning set forth in Rule&nbsp;405 under the Securities Act. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">18. <U>Amendments or Waivers</U>.&nbsp;No amendment or waiver of any provision of this Agreement or any Terms Agreement, nor any consent or
approval to any departure therefrom, shall in any event be effective unless the same shall be in writing and signed by the parties hereto or thereto as the case may be. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">19. <U>Headings</U>.&nbsp;The headings herein are included for convenience of reference only and are not intended to be part of, or to affect
the meaning or interpretation of, this Agreement. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">[Signature Page Follows] </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 33 - </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">If the foregoing correctly sets forth the understanding between the Partnership, the General
Partner, the Selling Unitholder and the Agents, please so indicate in the space provided below for that purpose, whereupon this letter and your acceptance shall constitute a binding agreement among the Partnership, the General Partner, the Selling
Unitholder and each Agent. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="12%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="87%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Very truly yours,</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">MPLX LP, by MPLX GP LLC, its general partner</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Nancy K. Buese</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Nancy K. Buese</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Financial Officer</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">MPLX GP LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Nancy K. Buese</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Nancy K. Buese</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Financial Officer</TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 34 - </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="12%"></TD>
<TD VALIGN="bottom"></TD>
<TD WIDTH="87%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">M&amp;R MWE Liberty, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ John Raymond</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">John Raymond</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Chief Executive Officer</TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 35 - </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">


<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="13%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="86%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">J.P. MORGAN SECURITIES LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Adam Rosenbluth</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Adam Rosenbluth</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Executive Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">MERRILL LYNCH, PIERCE, FENNER &amp; SMITH INCORPORATED</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ David Anders</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">David Anders</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Managing Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">CITIBANK GLOBAL MARKETS INC.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Mark Hobbs</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Mark Hobbs</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Managing Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">RBC CAPITAL MARKETS,&nbsp;LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Joseph Carey</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Joseph Carey</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Managing Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">WELLS FARGO SECURITIES, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Elizabeth Alvarez</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Elizabeth Alvarez</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Managing Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed to as of the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">UBS SECURITIES LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ James Walsh</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">James Walsh</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Director</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Preston Martin</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Preston Martin</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Associate Director</TD></TR>
</TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 36 - </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit A </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><U>MPLX LP Common Units </U></B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><U>TERMS AGREEMENT </U></B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 20&nbsp;&nbsp;&nbsp;&nbsp; </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;]<SUP STYLE="font-size:85%; vertical-align:top">1</SUP> </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Dear Sirs: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">MPLX LP, a Delaware limited
partnership (the &#147;<B>Partnership</B>&#148;)[, in its own capacity and in its capacity as custodian for M&amp;R MWE Liberty, LLC, a Delaware limited liability company (the &#147;<B>Selling Unitholder</B>&#148;)] proposes, subject to the terms
and conditions stated herein and in the Second Amended and Restated Distribution Agreement dated August&nbsp;[&#9679;], 2016 (the &#147;<B>Distribution Agreement</B>&#148;) between the Partnership and
[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;]<SUP STYLE="font-size:85%; vertical-align:top">2</SUP> (the &#147;<B>Agent</B>&#148;), [to issue and sell] [sell] to the Agent the securities specified in the Schedule hereto
(the &#147;<B>Purchased Securities</B>&#148;). Unless otherwise defined below, terms defined in the Distribution Agreement shall have the same meanings when used herein. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">Each of the provisions of the Distribution Agreement not specifically related to the solicitation by the Agent, as agent of the Partnership
[and Selling Unitholder], of offers to purchase securities is incorporated herein by reference in its entirety, and shall be deemed to be part of this Terms Agreement to the same extent as if such provisions had been set forth in full
herein.&nbsp;Each of the representations, warranties and agreements set forth therein shall be deemed to have been made as of the date of this Terms Agreement and the Settlement Date set forth in the Schedule hereto. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">An amendment to the Registration Statements or a supplement to the Prospectus, as the case may be, relating to the Purchased Securities, in
the form heretofore delivered to the Agent, is now proposed to be filed with the Securities and Exchange Commission. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">Subject to the terms
and conditions set forth herein and in the Distribution Agreement which are incorporated herein by reference, the Partnership agrees to issue and sell to the Agent [and agrees in its capacity as custodian for the Selling Unitholder to sell to the
Agent], and the latter agrees to purchase from the Partnership [and the Selling Unitholder], the Purchased Securities at the time and place and at the purchase price set forth in the Schedule hereto. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">Notwithstanding any provision of the Distribution Agreement or this Terms Agreement to the contrary, the Partnership [in its own capacity and
in its capacity as custodian for the Selling Unitholder] consents to the Agent trading in the Common Units for Agent&#146;s own account and for the account of its clients at the same time as sales of the Purchased Securities occur pursuant to this
Terms Agreement. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><I>[Signature Page Follows] </I></P>
<P STYLE="line-height:8.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000;width:10%">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="2%" VALIGN="top" ALIGN="left"><SUP STYLE="font-size:85%; vertical-align:top">1</SUP>&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">To be name and address of applicable Agent. </TD></TR></TABLE>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="2%" VALIGN="top" ALIGN="left"><SUP STYLE="font-size:85%; vertical-align:top">2</SUP>&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">To be name of the applicable Agent. </TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:8%; font-size:10pt; font-family:Times New Roman">If the foregoing is in accordance with your understanding, please sign and return to us a
counterpart hereof, whereupon this Terms Agreement, including those provisions of the Distribution Agreement incorporated herein by reference, shall constitute a binding agreement between the Agent and the Partnership. </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="12%"></TD>
<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="87%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">MPLX LP</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">MPLX GP LLC, its General Partner</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16" COLSPAN="3"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">[MPLX LP, in its capacity as custodian for M&amp;R MWE Liberty, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">MPLX GP LLC, its General Partner</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:]</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
</TABLE></DIV> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="19%"></TD>
<TD VALIGN="bottom"></TD>
<TD WIDTH="78%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">Accepted and agreed as of</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">the date first above written:</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;]<SUP STYLE="font-size:85%; vertical-align:top">3</SUP></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR></TABLE>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="7%"></TD>
<TD VALIGN="bottom"></TD>
<TD WIDTH="92%"></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>

<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name:</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title:</TD></TR>
</TABLE> <P STYLE="line-height:8.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000;width:10%">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="2%" VALIGN="top" ALIGN="left"><SUP STYLE="font-size:85%; vertical-align:top">3</SUP>&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">To be name of applicable Agent. </TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><U>Schedule to Terms Agreement </U></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Title of Purchased Securities: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Common Units
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Number of Units of Purchased Securities: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[&#9679;] units </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Initial Price to Public: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">$[&#9679;] per unit </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Purchase Price Payable by
the Agent: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">$[&#9679;] per unit </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Method of
and Specified Funds for Payment of Purchase Price: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[By wire transfer to a bank account specified by the Partnership in same day funds.]
</P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Method of Delivery: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[To the Agent&#146;s
account, or the account of the Agent&#146;s designee, at The Depository Trust Company via DWAC in return for payment of the purchase price.] </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Settlement
Date: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[&#9679;], 20[&#9679;] </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Closing
Location: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[&#9679;] </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Documents to be
Delivered: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The following documents referred to in the Distribution Agreement shall be delivered on the Settlement Date as a condition to the closing for
the Purchased Securities (which documents shall be dated on or as of the Settlement Date and shall be appropriately updated to cover any Permitted Free Writing Prospectuses and any amendments or supplements to the Registration Statement[s], the
Prospectus, any Permitted Free Writing Prospectuses and any documents incorporated by reference therein):</P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">the officer&#146;s certificate referred to in Section&nbsp;6(a)(i); </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">[the officer&#146;s certificate referred to in Section&nbsp;6(c)(i);] </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">the opinion and negative assurance letter of the Partnership&#146;s outside counsel referred to in Section&nbsp;6(a)(ii); </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">the opinion of the Partnership&#146;s outside counsel referred to in Section&nbsp;6(a)(iii); </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">[the opinion of the Selling Shareholder&#146;s outside counsel referred to in Section&nbsp;6(c)(ii);] </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">the &#147;comfort&#148; letter referred to in Section&nbsp;6(a)(iv); </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">the opinion and negative assurance letter referred to in Section&nbsp;6(b); and </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">such other documents as the Agent shall reasonably request. </TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">[Lockup:] </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[&#9679;] </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Time of sale: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[&#9679;] [a.m./p.m.] (New York City time) on [&#9679;], [&#9679;] </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Time of sale information: </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-3 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">


<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">The number of units of Purchased Securities set forth above </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">The initial price to public set forth above </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="3%" VALIGN="top" ALIGN="left">&#149;</TD>
<TD WIDTH="1%" VALIGN="top">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top"><B>[Other]</B> </TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">A-4 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit B </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><U>OFFICER&#146;S CERTIFICATE </U></B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Dated
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 20&nbsp;&nbsp;&nbsp;&nbsp; </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">I, [name], [title] of MPLX GP LLC, a
Delaware limited liability company (the &#147;<B>General Partner</B>&#148;) and the general partner of MPLX LP, a Delaware limited partnership (the &#147;<B>Partnership</B>&#148;), in my capacity as an officer of the General Partner, on behalf of
the General Partner, do hereby certify that this certificate is signed by me pursuant to the Second Amended and Restated Distribution Agreement dated &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,
20&nbsp;&nbsp;&nbsp;&nbsp; among the Partnership, the General Partner, M&amp;R MWE Liberty, LLC, a Delaware limited liability company, J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated, Citigroup Global Markets Inc.,
RBC Capital Markets, LLC, UBS Securities LLC and Wells Fargo Securities, LLC (the &#147;<B>Agreement</B>&#148;), and do hereby further certify on behalf of the Partnership, as follows:</P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">1.&nbsp;The representations and warranties of the Partnership in the Agreement are true and correct on and as of the date hereof as though
made on and as of this date. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">2.&nbsp;The Partnership has performed all obligations and satisfied all conditions on its part to be
performed or satisfied pursuant to the Agreement on or prior to the date hereof. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">3.&nbsp;The Partnership&#146;s Registration Statement
(File No.&nbsp;333-203067) and any post-effective amendments thereto have become effective under the Securities Act; no stop order suspending the effectiveness of such registration statement has been issued and no proceeding for that purpose or
pursuant to Section&nbsp;8A of the Securities Act has been initiated or, to the knowledge of the undersigned, threatened by the Commission; no notice of objection of the Commission to the use of such registration statement pursuant to
Rule&nbsp;401(g) under the Securities Act has been received by the Partnership; and all requests for additional information on the part of the Commission have been complied with. [and </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">4.&nbsp;The Partnership&#146;s Registration Statement&nbsp;(File No.&nbsp;333-211397) and any post-effective amendments thereto have become
effective under the Securities Act; no stop order suspending the effectiveness of such registration statement has been issued and no proceeding for that purpose or pursuant to Section&nbsp;8A of the Securities Act has been initiated or, to the
knowledge of the undersigned, threatened by the Commission; no notice of objection of the Commission to the use of such registration statement pursuant to Rule&nbsp;401(g) under the Securities Act has been received by the Partnership; and all
requests for additional information on the part of the Commission have been complied with. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">[4./5.]&nbsp;]Since the respective dates as of
which information is given in the Registration Statements, the Prospectus and any Permitted Free Writing Prospectus, except as otherwise stated therein, there has not been (i)&nbsp;any material adverse change, or any development involving a
prospective material adverse change, in the business, properties, management, financial condition or results of operations of the Partnership and the General Partner taken as a whole, (ii)&nbsp;any obligation or liability, direct or contingent
(including any off-balance sheet obligations), incurred by the Partnership or the General Partner, which is material to the Partnership and the General Partner taken as a whole or (iii)&nbsp;any material change in the Common Units of the Partnership
or outstanding indebtedness of the Partnership and its consolidated subsidiaries taken as a whole. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">5.&nbsp;I am generally familiar with
all actions, investigations, proceedings, and suits pending or threatened against the Partnership before any arbitrator, court or other governmental authority (&#147;<B>Proceedings</B>&#148;).&nbsp;To my knowledge, except as disclosed in the
Prospectus, there are no Proceedings against the Partnership that would be required to be described in the Prospectus pursuant to the rules and regulations under the Securities Act of 1933. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">6.&nbsp;The Partnership is not a party to any agreement that would require the inclusion in the Registration Statements of common units or
other securities owned by any person or entity other than the Partnership and Selling Unitholder. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">All capitalized terms used herein and
not otherwise defined shall have the respective meanings assigned to them in the Agreement. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-1 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">[Signature Page Follows] </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">IN WITNESS WHEREOF, the undersigned have hereunto set their hands on
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 20&nbsp;&nbsp;&nbsp;&nbsp;. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="98%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Name:</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:1.00em; text-indent:-1.00em; font-size:10pt; font-family:Times New Roman">Title:</P></TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">B-3 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit C </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>M&amp;R MWE Liberty, LLC </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Officer&#146;s Certificate </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>[date] </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">I, [name],
[title] of M&amp;R MWE Liberty, LLC (the &#147;<B>Selling Unitholder</B>&#148;) in my capacity as an officer of the Selling Unitholder, on behalf of the Selling Unitholder, do hereby certify that this certificate is signed by me pursuant to the
Second Amended and Restated Distribution Agreement dated&nbsp;August 3, 2016 among MPLX GP LLC, a Delaware limited partnership, MPLX LP, a Delaware limited partnership, the Selling Unitholder, J.P. Morgan Securities LLC, UBS Securities LLC, Merrill
Lynch, Pierce, Fenner &amp; Smith Incorporated, Citigroup Global Markets Inc., RBC Capital Markets, LLC and Wells Fargo Securities, LLC (the &#147;<B>Agreement</B>&#148;), and do hereby further certify on behalf of the Selling Unitholder, as
follows: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left">1.</TD>
<TD ALIGN="left" VALIGN="top">I have carefully examined the information contained in the Prospectus; and </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left">2.</TD>
<TD ALIGN="left" VALIGN="top">The representations and warranties of the Selling Unitholder set forth in Agreement are true and correct on and as of the date hereof and the Selling Unitholder has complied with all its agreements contained in the
Agreement and has satisfied all the conditions on its part to be performed or satisfied pursuant to the Agreement at or prior to the date hereof. </TD></TR></TABLE>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">[Signature page follows] </P>

<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">IN WITNESS WHEREOF, the undersigned have executed this Certificate as of the date first set forth
above. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="40%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt">


<TR>
<TD WIDTH="12%"></TD>
<TD VALIGN="bottom"></TD>
<TD WIDTH="85%"></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" COLSPAN="3">M&amp;R MWE LIBERTY, LLC</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">&nbsp;</P></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD></TR>
</TABLE></DIV>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">C-2 </P>


<p Style='page-break-before:always'>
<HR  SIZE="3" style="COLOR:#999999" WIDTH="100%" ALIGN="CENTER">

 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit D </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><U>MWE Subsidiaries </U></B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


<TR>
<TD WIDTH="78%"></TD>
<TD VALIGN="bottom" WIDTH="2%"></TD>
<TD WIDTH="20%"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; width:19.50pt; font-size:8pt; font-family:Times New Roman">Entity</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000">
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">State&nbsp;of&nbsp;Incorporation&nbsp;or<BR>Formation</P></TD></TR>


<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Centrahoma Processing LLC</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Jefferson Gas Gathering Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Blackhawk, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Bluestone Ethane Pipeline, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Buffalo Creek Gas Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Oklahoma</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy Appalachia, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy East Texas Gas Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy Finance Corporation</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy GP, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy Operating Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy South Texas Gas Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Energy West Texas Gas Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Gas Marketing, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Gas Services, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Hydrocarbon, Inc.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Javelina Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Javelina Pipeline Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Liberty Bluestone, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Liberty Ethane Pipeline, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Liberty Gas Gathering, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Liberty Midstream &amp; Resources, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Mariner Pipeline, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Marketing, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest McAlester, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Oklahoma</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Michigan Pipeline Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Michigan</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Mountaineer Pipeline Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest New Mexico, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Ohio Fractionation Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Oklahoma Gas Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Oklahoma</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Panola Pipeline, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Pinnacle, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Pioneer, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Pipeline Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest PNG Utility, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest POET, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Power Tex, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Ranger Pipeline Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Texas LPG Pipeline, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Texas PNG Utility, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Utica EMG, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Utica EMG Condensate, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">MarkWest Utica Operating Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Mason Pipeline Limited Liability Company</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Michigan</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Matrex, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Michigan</TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">D-1 </P>


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<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" ALIGN="center">


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<TD WIDTH="20%"></TD></TR>

<TR STYLE="font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; width:19.50pt; font-size:8pt; font-family:Times New Roman">Entity</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000">
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">State&nbsp;of&nbsp;Incorporation&nbsp;or<BR>Formation</P></TD></TR>


<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Mule Sidetracks, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Mule Tracts, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Ohio Condensate Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Ohio Gathering Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Ohio Utica Jefferson Dry Gas Gathering Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Panola Pipeline Company, LLC</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Texas</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">West Relay Gathering Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Delaware</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">West Shore Processing Company, L.L.C.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Michigan</TD></TR>
<TR STYLE="font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Wirth Gathering, a general partnership</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Oklahoma</TD></TR>
</TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">D-2 </P>

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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>d235314dex51.htm
<DESCRIPTION>EX-5.1
<TEXT>
<HTML><HEAD>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit 5.1 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="margin-top:0pt;margin-bottom:0pt" ALIGN="center">


<IMG SRC="g235314g0803134458698.jpg" ALT="LOGO">
 </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">NORTH POINT&nbsp;&#149;&nbsp;901 LAKESIDE AVENUE&nbsp;&#149;&nbsp;CLEVELAND, OHIO&nbsp;44114.1190 </P>
<P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">TELEPHONE: +1.216.586.3939 &#149; FACSIMILE: +1.216.579.0212 </P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">August 4, 2016 </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">MPLX LP </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">200 E. Hardin Street </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Findlay, Ohio 45840 </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="4%" VALIGN="top" ALIGN="left">Re:</TD>
<TD ALIGN="left" VALIGN="top">Up to (i) $1,181,240,389 of Common Units Representing Limited Partner Interests of MPLX LP, to be Offered by MPLX LP, and (ii) 16,714,547 Common Units Representing Limited Partner Interests of MPLX LP, to be offered by
the Selling Unitholder </TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Ladies and Gentlemen: </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We have acted as counsel for MPLX LP, a Delaware limited partnership (the &#147;<B><I>Partnership</I></B>&#148;), in connection with (i) the
issuance and sale of common units representing limited partner interests of the Partnership (&#147;<B><I>Units</I></B>&#148;) having an aggregate offering price of up to $1,181,240,389 (the &#147;<B><I>Authorized Units</I></B>&#148;) to be offered
by the Partnership and (ii) the sale of up to 16,714,547 Units, which consist of 12,364,490 Units (the &#147;<B><I>Outstanding EMG Units</I></B>&#148;) and 4,350,057 Units (the &#147;<B><I>Conversion Common Units</I></B>&#148; and, together with the
Authorized Units and Outstanding EMG Units, the &#147;<B><I>Common Units</I></B>&#148;) issuable upon conversion of 3,990,878 outstanding Class B limited partner interests in the Partnership (the &#147;<B><I>Outstanding Class B Units</I></B>&#148;)
to be sold by M&amp;R MWE Liberty, LLC, a Delaware limited liability company (the &#147;<B><I>Selling Unitholder</I></B>&#148;), in each case through J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner &amp; Smith Incorporated, Citigroup
Global Markets Inc., RBC Capital Markets, LLC, UBS Securities LLC and Wells Fargo Securities, LLC, acting as sales agents, pursuant to the Second Amended and Restated Distribution Agreement, dated August 4, 2016 (the &#147;<B><I>Distribution
Agreement</I></B>&#148;), among the Partnership, MPLX GP LLC, a Delaware limited liability company (the &#147;<B><I>General Partner</I></B>&#148;), the Selling Unitholder and the Agents.&nbsp;The Common Units&nbsp;may be offered and sold from time
to time pursuant to Rule 415 under the Securities Act of 1933 (the &#147;<B><I>Securities Act</I></B>&#148;) in accordance with the terms of the Distribution Agreement. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In connection with the opinion expressed herein, we have examined such documents, records and matters of law as we have deemed relevant or
necessary for purposes of this opinion. Based on the foregoing and subject to the further assumptions, qualifications and limitations set forth herein, we are of the opinion that: </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>
<TD WIDTH="8%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">1.</TD>
<TD ALIGN="left" VALIGN="top"> <P ALIGN="left" STYLE=" margin-top:0pt ; margin-bottom:0pt; font-family:Times New Roman; font-size:10pt">The Authorized Units, when issued and delivered pursuant to the terms of the Distribution Agreement against
payment of the consideration therefor as provided therein, will be validly issued, fully paid and nonassessable, except as such nonassessability may be limited by Sections 17-303, 17-607 and 17-804 of the
</P></TD></TR></TABLE>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">ALKHOBAR &#149;
AMSTERDAM &#149; ATLANTA &#149; BEIJING &#149; BOSTON &#149; BRISBANE &#149; BRUSSELS &#149; CHICAGO &#149; CLEVELAND &#149; COLUMBUS &#149; DALLAS </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">DETROIT &#149; DUBAI &#149; D&Uuml;SSELDORF &#149; FRANKFURT &#149; HONG&nbsp;KONG &#149; HOUSTON &#149; IRVINE &#149; JEDDAH &#149; LONDON
&#149; LOS&nbsp;ANGELES &#149; MADRID </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">MEXICO&nbsp;CITY &#149; MIAMI &#149; MILAN &#149; MINNEAPOLIS &#149; MOSCOW &#149; MUNICH &#149;
NEW&nbsp;YORK &#149; PARIS &#149; PERTH &#149; PITTSBURGH &#149; RIYADH </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center">SAN&nbsp;DIEGO &#149; SAN&nbsp;FRANCISCO &#149;
S&Atilde;O&nbsp;PAULO &#149; SHANGHAI &#149; SILICON&nbsp;VALLEY &#149; SINGAPORE &#149; SYDNEY &#149; TAIPEI &#149; TOKYO &#149; WASHINGTON </P>


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 <P STYLE="margin-top:0pt;margin-bottom:0pt" ALIGN="right">


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 </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">MPLX LP </P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">August 4, 2016 </P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"> Page
 2
 </P> <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P>

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<TR>
<TD WIDTH="13%">&nbsp;</TD>
<TD ALIGN="left" VALIGN="top">
Delaware Revised Uniform Limited Partnership Act (the &#147;<B><I>DRULP Act</I></B>&#148;) or within the Second Amended and Restated Agreement of Limited Partnership of the Partnership, dated as
of May 13, 2016, and as may be further amended from time to time (the &#147;<B><I>Partnership Agreement</I></B>&#148;). </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="8%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">2.</TD>
<TD ALIGN="left" VALIGN="top">The Outstanding EMG Units are validly issued, fully paid and nonassessable, except as such nonassessability may be limited by Sections 17-303, 17-607 and 17-804 of the DRULP Act or within the Partnership Agreement.
</TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="8%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">3.</TD>
<TD ALIGN="left" VALIGN="top">The Conversion Common Units, when issued upon conversion of the Outstanding Class B Units pursuant to the terms and conditions of the Outstanding Class B Units and the Partnership Agreement, will be validly issued,
fully paid and nonassessable, except as such nonassessability may be limited by Sections 17-303, 17-607 and 17-804 of the DRULP Act or within the Partnership Agreement. </TD></TR></TABLE>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In rendering the opinion in paragraph 1 above, we have assumed that (i) the resolutions authorizing the Partnership to issue and deliver and
sell the Authorized Units pursuant to the Distribution Agreement will be in full force and effect at all times at which the Authorized Units are issued and delivered or sold by the Partnership and the Partnership will take no action inconsistent
with such resolutions, and (ii) the timing of, the terms of and the consideration for each issuance of Authorized Units by the Partnership under the Distribution Agreement will be approved by the Board of Directors of the general partner of the
Partnership or an authorized committee or subcommittee of the Board of Directors of the general partner of the Partnership. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As to facts
material to the opinions expressed herein, we have relied upon oral or written statements and representations of officers and other representatives of the General Partner and others. The opinions expressed herein are limited to the DRULP Act and the
laws of the State of New York, in each case as currently in effect, and we express no opinion as to the effect of the laws of any other jurisdiction. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">We hereby consent to the filing of this opinion as Exhibit 5.1 to the Current Report on Form 8-K dated the date hereof filed by the
Partnership and incorporated by reference into the Registration Statements on Form S-3 (Registration Nos. 333-203067 and 333-211397) (the &#147;<B><I>Registration Statements</I></B>&#148;), filed by the Partnership to effect the registration of the
Common Units under the Securities Act and to the reference to Jones Day under the caption &#147;Legal Matters&#148; in the prospectus constituting a part of the Registration Statements.&nbsp;In giving such consent, we do not thereby admit that we
are included in the category of persons whose consent is required under Section 7 of the Act or the rules and regulations of the Securities and Exchange Commission promulgated thereunder. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; margin-left:54%; text-indent:-2%; font-size:10pt; font-family:Times New Roman">Very truly yours, </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:54%; text-indent:-2%; font-size:10pt; font-family:Times New Roman">/s/ Jones Day </P>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
