RV Toilets are not designed to be as tough as household domestic toilets. I have had to replace the water inlet valves in both my RVs three times in as many years. I live between my RVs, so they are almost used fulltime.
When the flush valve leaks, the water drips into the bowl, but there is no overflow. If the leak was left without shutting off the main water supply, the toilet would overflow directly to the bathroom floor. RVs aren’t required to install a floor waste drain, so this water will eventually flood the entire RV.
Just this week, having installed yet another water inlet valve, I decided to add an isolation valve in both my Fifthwheels. This makes it more convenient because I can now replace the inlet flush valve without the need to cut water off for the entire coach. If any leaks appear it’s easier to shut off the RV toilet water supply without going outside.
RV toilet water inlet valve leak at the cartridge where the pedal activates the water inlet.
Inside the cartridge holder showing the small rubber seal which often leaks.
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