Interesting that this has come up now - our Thetford Aqua II just wouldn't shut off one time so I'm looking at replacing the valve. We've spent about 1000 nights in our 7 year old RV. I removed the identical powder room toilet after 6 months to make room for cat box and feeding station. All our toilet use has been with this unit and until now it's been perfect.
Since I have to remove the old toilet to replace the valve, I think I'll just put the one that's been in stick house basement. I'll test it to make sure the gaskets and stuff haven't dried out before I install it.
Then I'll obtain replacement parts at my leisure. I'm not switching.
