Exhibit
4.3




Supplemental
Indenture (this “Supplemental Indenture”), dated as of February 14, 2007, among
Targa Resources GP LLC (the “Guaranteeing Subsidiary”), a subsidiary of Targa
Resources, Inc. (or its permitted successor), a Delaware corporation (the
“Company”), Targa Resources Finance Corporation, a Delaware corporation (the
“Co-Issuer”), the other Subsidiary Guarantors (as defined in the Indenture
referred to herein) and Wells Fargo Bank, National Association, as trustee under
the Indenture referred to below (the “Trustee”).




WITNESSETH




WHEREAS,
the Company and the Co-Issuer have heretofore executed and delivered to the
Trustee a senior unsecured indenture (the “Indenture”), dated as of October 31,
2005 providing for the issuance of 81⁄2% Senior Notes Due 2013 (the
“Notes”);




WHEREAS,
the Indenture provides that under certain circumstances a Guaranteeing
Subsidiary shall execute and deliver to the Trustee a supplemental indenture
pursuant to which the Guaranteeing Subsidiary shall unconditionally guarantee
all of the Company’s and the Co-Issuer’s Obligations under the Notes and the
Indenture on the terms and conditions set forth herein (the “Subsidiary
Guarantee”); and




WHEREAS,
pursuant to Section 901 of the Indenture, the Trustee is authorized to execute
and deliver this Supplemental Indenture.




NOW,
THEREFORE, in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the Guaranteeing
Subsidiary and the Trustee mutually covenant and agree for the equal and ratable
benefit of the Holders of the Notes as follows:




1.           CAPITALIZED
TERMS.   Capitalized terms used herein without definition shall
have the meanings assigned to them in the Indenture.




2.           AGREEMENT
TO SUBSIDIARY GUARANTEE.  The Guaranteeing Subsidiary hereby agrees to
provide an unconditional Subsidiary Guarantee on the terms and subject to the
conditions set forth in the Note Subsidiary Guarantee and in the Indenture
including but not limited to Article 12 thereof.




3.           NO
RECOURSE AGAINST OTHERS.   No past, present or future director,
officer, employee, incorporator, stockholder or agent of the Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the
Company, the Co-Issuer or any Guaranteeing Subsidiary under the Notes, any Note
Guarantees, the Indenture or this Supplemental Indenture or for any claim based
on, in respect of, or by reason of, such obligations or their creation; provided that the foregoing
shall not limit any of the Company’s or the Co-Issuer’s obligations under the
Notes.  Each Holder of the Notes by accepting a Note waives and
releases all such liability.  The waiver and release are part of the
consideration for issuance of the Notes.  Such waiver may not be
effective to waive liabilities under the federal securities laws and it is the
view of the SEC that such a waiver is against public policy.




4.           GOVERNING
LAW.   This Supplemental Indenture shall be governed by and
construed in accordance with the laws of the State of New York.




5.           COUNTERPARTS.   The
parties may sign any number of copies of this Supplemental
Indenture.  Each signed copy shall be an original, but all of them
together represent the same agreement.




6.           EFFECT
OF HEADINGS.  The Section headings herein are for convenience only and
shall not affect the construction hereof.







7.           THE
TRUSTEE.  The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiaries, the Co-Issuer and the
Company.




IN
WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to
be duly executed and attested, all as of the date first above
written.




Dated:
February 14, 2007




TARGA
      RESOURCES GP LLC








By:
            /s/ Howard M.
      Tate


Name:                 Howard
M. Tate


Title:
            Vice
      President - Finance and Assistant
Treasurer





TARGA
      RESOURCES, INC.








By:
            /s/ Howard M.
      Tate


Name:                 Howard
M. Tate


Title:
            Vice
      President - Finance and Assistant
Treasurer





TARGA
      RESOURCES FINANCE CORPORATION








By:
            /s/ Howard M.
      Tate


Name:                 Howard
M. Tate


Title:
            Vice
      President - Finance and Assistant
Treasurer











TARGA
      LOUISIANA FIELD SERVICES LLC


TARGA
      LOUISIANA INTRASTATE LLC


TARGA
      RESOURCES LLC


TARGA
      RESOURCES II LLC


TARGA
      RESOURCES HOLDINGS GP LLC


TARGA
      RESOURCES HOLDINGS LP


TARGA
      RESOURCES TEXAS GP, LLC


TARGA
      TEXAS FIELD SERVICES LP


TARGA
      MIDSTREAM GP, LLC


TARGA
      GAS MARKETING LLC


TARGA
      MIDSTREAM SERVICES LIMITED PARTNERSHIP (formerly known as
      Dynegy


Midstream
      Services, Limited Partnership)


TARGA
      ENERGY PIPELINE LLC (formerly known as Dynegy Energy Pipeline,
      L.L.C.)


TARGA
      INTRASTATE PIPELINE LLC (formerly known as Dynegy Intrastate Pipeline,
      L.L.C.)


TARGA
      LIQUIDS GP LLC (formerly known as Dynegy Liquids G.P.,
    L.L.C.)


TARGA
      LIQUIDS MARKETING AND TRADE (formerly known as Dynegy Liquids Marketing
      and Trade)


TARGA
      NGL PIPELINE COMPANY LLC (formerly known as Dynegy NGL Pipeline Company,
      LLC)


TARGA
      OPI LLC (formerly known as Dynegy OPI,
LLC)


TARGA
      REGULATED HOLDINGS LLC (formerly known as Dynegy Regulated Holdings
      LLC)


MIDSTREAM
      BARGE COMPANY LLC (formerly known as Midstream Barge Company
      L.L.C.)


TARGA
      GP INC.


TARGA
      LP INC.


TARGA
      NORTH TEXAS GP LLC


TARGA
      VERSADO GP LLC


TARGA
      STRADDLE GP LLC


TARGA
      PERMIAN GP LLC


TARGA
      DOWNSTREAM GP LLC


TARGA
      NORTH TEXAS LP


TARGA
      VERSADO LP


TARGA
      STRADDLE LP


TARGA
      PERMIAN LP


TARGA
      DOWNSTREAM LP


TARGA
      LSNG GP LLC


TARGA
      LSNG LP





By:
            /s/ Howard M.
      Tate


Name:                 Howard
M. Tate


Title:
            Vice
      President - Finance and Assistant
Treasurer








WELLS
      FARGO BANK, NATIONAL ASSOCIATION, as
Trustee





By:
            __/s/ Joseph
      O’Donnell_______


Authorized
      Signatory