Why Won't the Thetford Toilet Riser Work With the Dometic 320
Updated 12/15/2025 | Published 11/16/2024
Products Featured in This Question
Question:
Thetford Toilet Riser - 2-1/2inch Tall - White Explain why this would not work with a Dometic 320. If the floor flange is built into the riser and it is the standard size and design flange, why cant this be universal?
asked by: Mike
Expert Reply:
Hello Mike.
The Thetford Toilet Riser - 2-1/2" Tall - White # TH97UE will not work with the Dometic 320 because the base of the toilet is constructed differently, and the toilet sits on top of the Thetford Toilet Riser. If you look at the Dometic 510 # DOM29FR you will see that the base does not flare out like the Dometic 320 # DOM87FR. It is not the flange that is making it not work with the Dometic 320, it is how the base flares out. I have attached images so you can see the difference.
(click to enlarge)
(click to enlarge)
Product Page this Question was Asked From
Thetford Toilet Riser - 2-1/2" Tall - White
- Accessories and Parts
- RV Toilet
- Risers
- Thetford
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Kate F.
12/15/2025
Hey Mike, did the comparison between the Dometic 320 and 510 help clear up why the Thetford riser wouldn’t fit? Knowing what you found could help others trying to match a riser to their toilet base.