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Replacement Waste Valve with Bayonet End and 3" Hub End  

Updated 11/10/2025 | Published 01/01/2025

Question:

Hi, Looking for a gate valve that is 3 bayonette 3 id, 3.5 od and 3 slip on the other side 3 id, 3.5 od

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Expert Reply:

Hey Steve, thanks for the photos!

The Bristol Waste Valve for RV Black Water Tank - 3" Hub to 3" Lug # 34466N5A will definitely fit in place of your current valve, but it comes with 4 lugs instead of the 3 that you said you have.

From the photos you sent in you should be able to use this 4-lug system, but if not, the Valterra Bladex Waste Valve Body # T1003VPM will sandwich between the ends that you currently have so you can just reuse them.

expert reply by:
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Jon G
Bayonet Opening on Waste Valve
Bayonet Opening on Waste Valve
(click to enlarge)
Side Profile of RV Waste Valve
Side Profile of RV Waste Valve
(click to enlarge)
Jon G. profile picture

Jon G.

11/3/2025

Hey Steve, how did things go with the Bristol waste valve for your RV tank? Did the 4-lug setup end up fitting your system, or did you go with the Valterra Bladex valve instead? Your update could make it easier for others working on a similar connection.

Steve S. profile picture

Steve S.

11/10/2025

@JonG I ended up with a T50A Valterra Waste Valve for RV Black Water Tank - 3" Spigot to 3" Lug
Gwendolyn Y. profile picture
Etrailer Expert

Gwendolyn Y.

11/10/2025

@SteveS I'm glad you were able to find something that worked for your set up, Steve!

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