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How Does Freshwater Reservoir Get Filled on Thetford C224CW Cassette Toilet  

Updated 10/12/2026 | Published 10/07/2026

Question:

I can’t find any information on how the freshwater reservoir for this manual flush toilet gets filled? TH29UE

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Expert Reply:

Hey Elliot, the Thetford C224CW # TH29UE has its own 2.37-gallon freshwater flush tank, but it isn't filled from inside at the toilet itself.

It is designed to be filled through an exterior water-fill door installed in the RV wall. The fill door is not included with TH29UE. It is Thetford part # 2379180 which is something at this time we do not carry.

expert reply by:
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Jameson C
Scott profile picture

Scott

10/11/2026

The external locking fill door needs to be purchased separately. The wall thickness of my van was greater than the parts provided but the modification was simple. The things I like about this toilet are that it operates without being tied to my water supply and doesn’t require power. Best of luck with your project.

Jameson C. profile picture
Etrailer Expert

Jameson C.

10/12/2026

@Scott glad you like it!

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