Replacement Flush Valve for a Thetford 42072 Toilet

Updated 12/01/2025 | Published 11/08/2025

Question:

I have a thetford 42072 toilet and in of a flush valve can you help.

asked by: Curtis

Thetford 42072 Toilet
(click to enlarge)

Expert Reply:

I sure can Curtis, and thanks for the picture! To replace the flush valve on your Thetford 42072 toilet you will need the Replacement Water Valve for Thetford Aqua-Magic Style II RV Toilet item # TH78SA. This kit will get your toilet back up and running.

What kind of motorhome or trailer do you have?

You can add this information and any other questions you have where it says Reply to Jerred H and I'll be happy to answer them.

expert reply by: Jerred H

Jerred H.

12/1/2025

Hey Curtis, how did the replacement water valve work out on your Thetford 42072 toilet? Sharing what you found could help others trying to fix the same issue.