Looking for Replacement Water Valve and Ball Gasket for Thetford 42058 Aqua-Magic Style II RV toilet
Updated 05/23/2026 | Published 05/17/2026
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Question:
Need replacement water valve, and flush ball gasket, for Thetford 42058 Aqua-Magic Style II RV toilet. Also need replacement instructions
asked by: Tom R
0
Expert Reply:
Hey Tom, the correct replacement water valve you would need for the Aqua-Magic Style II would be the part # TH78SA. Then for the replacement ball gasket you would need the part # TH34FR33AB. Instructions are linked below.
expert reply by:
Jameson C
0
Product Page this Question was Asked From
Replacement Water Valve for Thetford Aqua-Magic Style II RV Toilet - Restores Flush Power - Qty 1
- Accessories and Parts
- RV Toilets
- Valves
- Water Valve
- Thetford
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Mi C.
5/23/2026
Tom, I recently replaced both the waste ball and seal as well as the water inlet valve in our 2020 trailer. The replacement parts were easy to install (I did remove the toilet from the trailer first to have more room to work) and did the job! I really only needed to replace the waste ball seal (small amount of water left in the toilet to act as additional seal would leak down into the black tank after a while), but decided to replace the water inlet valve and seals while I was at it. There is a very good video on YouTube at this link: https://www.youtube.com/watch?v=ACBLn1E8QLM Easy job - you'll be glad you did it.