ENERGY TRANSFER PARTNERS (ETP)

FOURTH SUPPLEMENTAL INDENTURE

Dated as of June 29, 2006

to

Indenture dated as of January 18, 2005, as amended to the date hereof

5.95% Senior Notes due 2015

5.65% Senior Notes due 2012

THIS FOURTH SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of June 29, 2006, is among Energy Transfer Partners, L.P., a Delaware limited partnership (the “Partnership”), ET Fuel Pipeline, L.P., a Delaware limited partnership, Titan Energy GP, L.L.C., a Delaware limited liability company, Titan Energy Partners, L.P., a Delaware limited partnership, Titan Propane LLC, a Delaware limited liability company, and Titan Propane Services, Inc., a Delaware corporation (each, a “Guaranteeing Subsidiary” and collectively, the “Guaranteeing Subsidiaries”), HPL Holdings GP, L.L.C., a Delaware limited liability company, HP Houston Holdings, L.P., a Delaware limited partnership, HPL Consolidation LP, a Delaware limited partnership, HPL Storage GP, LLC, a Delaware limited liability company, HPL Asset Holdings, LP, a Delaware limited partnership, HPL Leaseco, LP, a Delaware limited partnership, HPL GP, LLC, a Delaware limited liability company, Houston Pipe Line Company, LP, a Delaware limited partnership, HPL Resources Company, LP, a Delaware limited partnership, HPL Gas Marketing, LP, a Delaware limited partnership, and HPL Houston Pipe Line Company, LLC, a Delaware limited liability company, La Grange Acquisition, L.P., a Texas limited partnership, Five Dawaco, LLC, a Texas limited liability company, ET Company I, Ltd., a Texas limited partnership, Chalkley Transmission Company, Ltd., a Texas limited partnership, Whiskey Bay Gathering Company, Ltd., a Texas limited partnership, Whiskey Bay Gas Company, Ltd., a Texas limited partnership, TETC, LLC, a Texas limited liability company, Texas Energy Transfer Company, Ltd., a Texas limited partnership, LG PL, LLC, a Texas limited liability company, ETC Texas Pipeline, Ltd., a Texas limited partnership, ETC Oklahoma Pipeline, Ltd., a Texas limited partnership, ETC Texas Processing, Ltd., a Texas limited partnership, ETC Katy Pipeline, Ltd., a Texas limited partnership, ETC Gas Company, Ltd., a Texas limited partnership, LGM, LLC, a Texas limited liability company, ETC Marketing, Ltd., a Texas limited partnership, ETC Oasis GP, LLC, a Texas limited liability company, Oasis Pipeline, LP, a Texas limited partnership, ETC Oasis, L.P., a Delaware limited partnership, Energy Transfer Fuel GP, LLC, a Delaware limited liability company, Energy Transfer Fuel, LP, a Delaware limited partnership, Oasis Pipe Line Company, a Delaware corporation, Oasis Pipe Line Finance Company, a Delaware corporation, Oasis Partner Company, a Delaware corporation, Oasis Pipe Line Management Company, a Delaware corporation, and Oasis Pipe Line Company Texas L.P., a Texas limited partnership (collectively, the “Subsidiary Guarantors”), and U.S. Bank National Association, a national banking association, successor-by-merger to Wachovia Bank, National Association, as trustee under the Indenture referred to below (the “Trustee”).

RECITALS:

WHEREAS, the Partnership and the Subsidiary Guarantors have heretofore executed and delivered to the Trustee an Indenture, dated as of January 18, 2005, as supplemented by that certain First Supplemental Indenture, dated as of January 18, 2005, that certain Second Supplemental Indenture dated February 24, 2005, and that certain Third Supplemental Indenture dated July 29, 2005 (as supplemented, the “Indenture”), providing for the issuance of an initial aggregate principal amount of $750,000,000 of 5.95% Senior Notes due 2015 and the issuance of an initial aggregate principal amount of $400,000,000 of 5.65% Senior Notes due 2012 (collectively, the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances the Guaranteeing Subsidiaries shall execute and deliver to the Trustee a supplemental indenture pursuant to which

the Guaranteeing Subsidiaries shall unconditionally guarantee all of the Partnership’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein (the “Subsidiary Guarantee”) and

WHEREAS, pursuant to Section 9.01 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 parties hereto do hereby mutually covenant and agree as follows:

THIRD SUPPLEMENTAL INDENTURE

Dated as of July 29, 2005

to

Indenture dated as of January 18, 2005

5.65% Senior Notes due 2012

Second Supplemental Indenture

THIS SECOND SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”), dated as of February 24, 2005, is among Energy Transfer Partners, L.P., a Delaware limited partnership (the “Partnership”), HPL Holdings GP, L.L.C., a Delaware limited liability company, HP Houston Holdings, L.P., a Delaware limited partnership, HPL Consolidation LP, a Delaware limited partnership, HPL Storage GP, LLC, a Delaware limited liability company, HPL Asset Holdings, LP, a Delaware limited partnership, HPL Leaseco, LP, a Delaware limited partnership, HPL GP, LLC, a Delaware limited liability company, Houston Pipe Line Company, LP, a Delaware limited partnership, HPL Resources Company, LP, a Delaware limited partnership, HPL Gas Marketing, LP, a Delaware limited partnership, and HPL Houston Pipe Line Company, LLC, a Delaware limited liability company (each, a “Guaranteeing Subsidiary” and collectively, the “Guaranteeing Subsidiaries”), La Grange Acquisition, L.P., a Texas limited partnership, Five Dawaco, LLC, a Texas limited liability company, ET Company I, Ltd., a Texas limited partnership, Chalkley Transmission Company, Ltd., a Texas limited partnership, Whiskey Bay Gathering Company, Ltd., a Texas limited partnership, Whiskey Bay Gas Company, Ltd., a Texas limited partnership, TETC, LLC, a Texas limited liability company, Texas Energy Transfer Company, Ltd., a Texas limited partnership, LG PL, LLC, a Texas limited liability company, ETC Texas Pipeline, Ltd., a Texas limited partnership, ETC Oklahoma Pipeline, Ltd., a Texas limited partnership, ETC Texas Processing, Ltd., a Texas limited partnership, ETC Katy Pipeline, Ltd., a Texas limited partnership, ETC Gas Company, Ltd., a Texas limited partnership, LGM, LLC, a Texas limited liability company, ETC Marketing, Ltd., a Texas limited partnership, ETC Oasis GP, LLC, a Texas limited liability company, Oasis Pipeline, LP, a Texas limited partnership, ETC Oasis, L.P., a Delaware limited partnership, Energy Transfer Fuel GP, LLC, a Delaware limited liability company, Energy Transfer Fuel, LP, a Delaware limited partnership, Oasis Pipe Line Company, a Delaware corporation, Oasis Pipe Line Finance Company, a Delaware corporation, Oasis Partner Company, a Delaware corporation, Oasis Pipe Line Management Company, a Delaware corporation, and Oasis Pipe Line Company Texas L.P., a Texas limited partnership (collectively, the “Subsidiary Guarantors”), and Wachovia Bank, National Association, a national banking association, as trustee under the Indenture referred to below (the “Trustee”).

RECITALS:

WHEREAS, the Partnership and the Subsidiary Guarantors have heretofore executed and delivered to the Trustee an Indenture, dated as of January 18, 2005, and that certain supplemented by a First Supplemental Indenture, dated as of January 18, 2005 (as supplemented, the “Indenture”), providing for the issuance of an initial aggregate principal amount of $750,000,000 of 5.95% Senior Notes due 2015 (the “Notes”);

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

WHEREAS, pursuant to Section 9.01 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 parties hereto do hereby mutually covenant and agree as follows: