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Old 03-28-2007, 06:13 PM   #1
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Repairing Thetford Toilet

I have a 65 Safari ,rear bath with the fiberglass bench over a Thetford Toilet. I just finished restoring the fiberglass bath, but when I went to install the toilet, it wouldn't stop running. Fortunately, I simply hooked it up without installing it first, to see if it would work. I just bought this trailer and the water supply to toilet was ruptured due to freezing and so I'd never actually used the toilet before. Also, this is my first Airstream. I'm a very competent plumber when it comes to residential plumbing, but I've never seen anything like this Thetford thing. It has a water inlet, then a line coming out of the other side of the inlet valve of the toilet that runs parallel to the floor, going about 18" toward curbside, then goes up about 10" to some kind of mushroom looking thing, then another line coming down and going back to toilet bowl. Anyway, now that I've hooked up the water supply, it just keeps running and running and would overflow the bowl if I didn't turn off the water supply. The toilet is in OK shape and it's a little late to modify the fiberglass bathroom, seeing how I just spent $600 to restore it, so my preference is to repair this toilet. Any ideas? Where do you get parts for this thing? Where do I start?

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Old 03-28-2007, 06:55 PM   #2
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1988 25' Excella
Sunnyvale , California
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BIG Rv parts places, or Thetford direct...


Congrats on at least discovering the problem before re-installing the toilet.. You've deprived us of a "funny story", but saved yourself some grief... The Thetfords are prone to flush valve failure if frozen with any water in them. We have funny story about sprinkler-like spray across bath coordinated with water pump cycles....

Anyway, the best way to repair them is upside down and removed... You should find model number stamped on it somewhere, and Thetford or RV Parts place can find or order parts... Try looking at:
Thetford - Parts Information where they offer exploded view diagrams and parts listings... Easier than real plumbing, just flimsier.. Separate line may be small line to put water into bowl....

Good luck


In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference...
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Old 03-28-2007, 06:59 PM   #3
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One good supplier of Thetford WC parts:
Toilet Parts for RV Repairs
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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