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post #1 of 4 (permalink) Old 08-06-2019, 07:08 Thread Starter
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Thetford C200

Our Autocruise Starblazer has just developed a water leak originating from a faulty vacuum breaker in the Thetford toilet.
After removing the bowl and associated pipework and assessing the situation I have a couple of questions.
The reason for the vacuum breaker, I believe, is to prevent backflow from the toilet pipework back to the fresh water tank.
Can a simple inline non return valve be used instead, placed in the supply line and not hidden away under the toilet bowl?
On the same note, is there any reason for the solenoid valve to be tucked away under the bowl?
It was a bloody nightmare taking the toilet apart to access the pipework but at least it gave me chance to thoroughly clean and disinfect the whole loo.
Jim
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post #2 of 4 (permalink) Old 08-06-2019, 08:59
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It sounds like bad design that some part that could fail requires the whole unit to be dismantled.

I've never liked the idea of flush water coming from the main tank.

Mine has it's own tank filled from outside. In extremis, one could fill it from a stream. With a decent solar set-up, fresh water and gas are the things that need careful management if you want to wildcamp as I do.

Regarding your problem, a vacuum breaker by design needs to be at the top of a loop of pipe. If you removed it and put a non-return valve elsewhere, what if that failed? You could have a backflow.

I think if I was in your situation, I might be looking for a way to make an access panel in the bulkhead above the loo and relocate the vacuum breaker there.

I'm daft and proud of it.
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post #3 of 4 (permalink) Old 10-06-2019, 05:15 Thread Starter
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"If you removed it and put a non-return valve elsewhere, what if that failed? You could have a backflow"

In my case the vacuum breaker failed, causing the van to flood. Luckily I discovered it before the whole tank emptied into the van. At least with a non return valve, if it failed I could have back flow as opposed to a flood. I know which one I'd prefer.
I'm not exactly over the moon with the flush water pumped from the fresh water tank, but thats what this particular van comes with. I've a good mind to blank the supply and use a jug to flush the loo.
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post #4 of 4 (permalink) Old 10-06-2019, 19:44
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I seldom use the flush (which comes from the fresh tank). I just wipe the bowl down, drop the paper in then spray with my vinegar-water spray bottle. Works a treat and I don't have to empty so often.

Jean
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