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EXHIBIT 4.6

SUPPLEMENTAL INDENTURE

SUPPLEMENTAL INDENTURE(this Supplemental Indenture), dated as of June
27, 2002, among TEPPCO Partners, L.P., a Delaware limited partnership (the
Partnership), TE Products Pipeline Company, Limited Partnership, a Delaware
limited partnership (TE Products), TCTM, L.P., a Delaware limited partnership
(TCTM), TEPPCO Midstream Companies, L.P., a Delaware limited partnership
(TEPPCO Midstream), Jonah Gas Gathering Company, a Wyoming general
partnership (Jonah Gas, and together with TE Products, TCTM and TEPPCO
Midstream, collectively, the Initial Subsidiary Guarantors), Val Verde Gas
Gathering Company, L.P., a Delaware limited partnership (the New Subsidiary
Guarantor), and Wachovia Bank, National Association(formerly known as First
Union National Bank), as trustee under the indenture referred to below (in such
capacity, the Trustee).

WITNESSETH:

WHEREAS, the Partnership and the Initial Subsidiary Guarantors have
heretofore executed and delivered to the Trustee an Indenture dated as of
February 20, 2002 (the Original Indenture), providing for the Partnerships
issuance, from time to time, of its Debt Securities in one or more series
unlimited as to principal amount, and the Guarantees by each of the Subsidiary
Guarantors of the Debt Securities;

WHEREAS, the Partnership and the Initial Subsidiary Guarantors have
heretofore executed and delivered to the Trustee a First Supplemental Indenture
dated as of February 20, 2002 (the First Supplemental Indenture, and together
with the Original Indenture, the Indenture), providing for the Partnerships
issuance of the initial series of its Debt Securities under the Indenture, such
series known as the Partnerships 7.625% Senior Notes due 2012 (the 2012
Notes);

WHEREAS, Section 4.14 of the Indenture provides that if a Subsidiary of
the Partnership guarantees any Funded Debt of the Partnership, the Partnership
shall cause each such Subsidiary to execute and deliver to the Trustee an
indenture supplemental to the Indenture pursuant to which each such Subsidiary
shall unconditionally and absolutely guarantee, to the extent set forth in the
Indenture and subject to the provisions of the Indenture, the due and punctual
payment of the principal of, and the premium, if any, and interest on, the 2012
Notes and all other amounts due and payable under the Indenture and the 2012
Notes by the Partnership;

WHEREAS, the New Subsidiary Guarantor is a Subsidiary of the Partnership,
and pursuant to the provisions of Section 4.14 of the Indenture, the
Partnership is required to cause the New Subsidiary Guarantor to so guarantee
the 2012 Notes;

WHEREAS, Section 9.01(g) of the Indenture authorizes the Partnership, the
Subsidiary Guarantors and the Trustee, from time to time and at any time, and
without the consent of the Holders, to enter into one or more indentures
supplemental to the Indenture to add Subsidiary Guarantors with respect to any
or all Debt Securities;

WHEREAS, the Partnership desires to cause the New Subsidiary Guarantor,
and the New Subsidiary Guarantor desires, to become a Subsidiary Guarantor with
respect to the 2012 Notes;

WHEREAS, Section 9.01 of the Indenture authorizes the Trustee to join with
the Partnership and the Subsidiary Guarantors in the execution of this
Supplemental Indenture for the

Val Verde Gas Gathering Company, L.P.
Supplemental Indenture (Additional Guarantor)

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purpose of adding a Subsidiary Guarantor, and
further provides that any such supplemental Indenture may be executed by the
Partnership, the Subsidiary Guarantors and the Trustee without the consent of
the Holders of any Debt Securities at the time Outstanding; and

WHEREAS, all things necessary have been done to make the Guarantee of the
2012 Notes by the New Subsidiary Guarantor the valid obligation of the New
Subsidiary Guarantor and to make this Supplemental Indenture a valid agreement
of the Partnership and the New Subsidiary Guarantor, in accordance with their
respective terms;

NOW, THEREFORE, in consideration of the foregoing and for other good and
valuable consideration, and reasonably equivalent valuable, the receipt of
which is hereby acknowledged, the Partnership, the Initial Subsidiary
Guarantors, the New Subsidiary Guarantor and the Trustee mutually covenant and
agree for the equal and proportionate benefit of the Holders of the 2012 Notes
as follows:

1.     Capitalized Terms. Capitalized terms used and not defined herein shall
have the meanings assigned in the Indenture.

2.     Agreement to Guarantee. The New Subsidiary Guarantor hereby agrees,
jointly and severally with all other Subsidiary Guarantors, unconditionally and
absolutely to guarantee, to the extent set forth in the Indenture and subject
to the provisions of the Indenture, the due and punctual payment of the
principal of, and the premium, if any, and interest on, the 2012 Notes and all
other amounts due and payable under the Indenture and the 2012 Notes by the
Partnership and to be bound by all other applicable provisions of the
Indenture. Further, the New Subsidiary Guarantor acknowledges and agrees that
its obligations to the Holders of the 2012 Notes and to the Trustee pursuant to
the Guarantee and the Indenture are expressly set forth in Article XIV of the
Indenture, and reference is hereby made to the Indenture for the precise terms
of the Guarantee.

3.     No Recourse Against Others. The General Partner and its directors,
officers, employees, incorporators and stockholders, as such, shall have no
liability for any obligations of the Partnership or the Subsidiary Guarantors
under the 2012 Notes, the 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. By accepting a 2012 Note, each Holder waived
and released all such liability. The waiver and release are a part of the
consideration for issuance of the 2012 Notes.

4.     NEW YORK LAW TO GOVERN. THIS SUPPLEMENTAL INDENTURE SHALL BE DEEMED TO
BE A NEW YORK CONTRACT AND FOR ALL PURPOSES SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF SAID STATE.

5.     Counterparts. The parties may sign any number of counterparts of this
Supplemental Indenture, each of which shall be an original; but such
counterparts shall together constitute but one and the same instrument.

6.     Effect of Headings. The headings herein are for convenience only and
shall not affect the construction hereof.

7.     The Trustee. The recitals and statements contained in this
Supplemental Indenture shall be taken as recitals and statements of the
Partnership, and the Trustee assumes no responsibility for the correctness of
same. The Trustee makes no representation or warranty as to

Val Verde Gas Gathering Company, L.P.
Supplemental Indenture (Additional Guarantor)

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the validity or
sufficiency of this Supplemental Indenture, except that it is duly authorized
to execute and deliver this instrument.

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

Dated: June 27, 2002

| |  |                                                   |  |                                                                     
| |  | ------------------------------------------------- |  | --------------------------------------------------------------------
| |  | TEPPCO Partners, L.P.                            
| |  |                                                   |  |                                                                     
| |  | By                                                |  | Texas Eastern Products Pipeline Company, LLC
Its General Partner    
| |  |                                                   |  |                                                                     
| |  | By:                                               |  | /s/ CHARLES H. LEONARD                                              
| |  |                                                   |  |                                                                     
| |  |                                                   |  | Charles H. Leonard
Senior Vice President and Chief Financial Officer
| |  |                                                   |  |                                                                     
| |  |                                                   |  |                                                                     
| |  | TE Products Pipeline Company, Limited Partnership
| |  |                                                   |  |                                                                     
| |  | By                                                |  | TEPPCO GP, Inc.
Its General Partner                                 
| |  |                                                   |  |                                                                     
| |  | By:                                               |  | /s/ CHARLES H. LEONARD                                              
| |  |                                                   |  |                                                                     
| |  |                                                   |  | Charles H. Leonard
Senior Vice President                            
| |  |                                                   |  |                                                                     
| |  |                                                   |  |                                                                     
| |  | TCTM, L.P.                                       
| |  |                                                   |  |                                                                     
| |  | By                                                |  | TEPPCO GP, Inc.
Its General Partner                                 
| |  |                                                   |  |                                                                     
| |  | By:                                               |  | /s/ CHARLES H. LEONARD                                              
| |  |                                                   |  |                                                                     
| |  |                                                   |  | Charles H. Leonard
Senior Vice President                            
| |  |                                                   |  |                                                                     
| |  |                                                   |  |                                                                     
| |  | TEPPCO Midstream Companies, L.P.                 
| |  |                                                   |  |                                                                     
| |  | By                                                |  | TEPPCO GP, Inc.
Its General Partner                                 
| |  |                                                   |  |                                                                     
| |  | By:                                               |  | /s/ CHARLES H. LEONARD                                              
| |  |                                                   |  |                                                                     
| |  |                                                   |  | Charles H. Leonard
Senior Vice President                            

Val Verde Gas Gathering Company, L.P.
Supplemental Indenture (Additional Guarantor)

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| |  |                                                 |  |                                              
| |  | ----------------------------------------------- |  | ---------------------------------------------
| |  | Jonah Gas Gathering Company                    
| |  |                                                 |  |                                              
| |  | By                                              |  | TEPPCO GP, Inc.
Its Managing General Partner 
| |  |                                                 |  |                                              
| |  | By:                                             |  | /s/ CHARLES H. LEONARD                       
| |  |                                                 |  |                                              
| |  |                                                 |  | Charles H. Leonard
Senior Vice President     
| |  |                                                 |  |                                              
| |  |                                                 |  |                                              
| |  | Val Verde Gas Gathering Company, L.P.          
| |  |                                                 |  |                                              
| |  | By                                              |  | TEPPCO NGL Pipelines, LLC
Its General Partner
| |  |                                                 |  |                                              
| |  | By:                                             |  | /s/ CHARLES H. LEONARD                       
| |  |                                                 |  |                                              
| |  |                                                 |  | Charles H. Leonard
Senior Vice President     
| |  |                                                 |  |                                              
| |  |                                                 |  |                                              
| |  | Wachovia Bank, National Association,
as Trustee
| |  |                                                 |  |                                              
| |  | By:                                             |  | /s/ KEVIN M. DOBRAVA                         
| |  |                                                 |  |                                              
| |  |                                                 |  | Kevin M. Dobrava
Vice President              

Val Verde Gas Gathering Company, L.P.
Supplemental Indenture (Additional Guarantor)

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