JOINDER TO REGISTRATION RIGHTS AGREEMENT

Exhibit 10.39.1

JOINDER TO

REGISTRATION RIGHTS AGREEMENT

Each of the undersigned hereby agrees that, as of the date hereof, it shall become a party to the Registration Rights Agreement, dated as of January 18, 2005 (the “Registration Rights Agreement”), by and among Energy Transfer Partners, L.P., the Guarantors named therein and Wachovia Capital Markets, LLC, Banc of America Securities Corp., BNP Paribas Securities Corp. and Greenwich Capital Markets, Inc. as a Guarantor and shall hereafter be fully bound by, and subject to, the provisions of the Registration Rights Agreement that are applicable to a Guarantor as though an original party thereto and shall hereafter be deemed a Guarantor for all purposes thereof.

Dated this 24th day of February, 2005.

Joinder Agreement

Joinder Agreement

Joinder Agreement