Thetford Cassette C402 or C403 Gasket???
- Thread starter rob.mwpropane
- Start date
Got notice of cancellation today and refund
I had already ordered the cheaper one as a spare, figured for 10$ I could keep a spare.Ok had to replace the motor and found that the hose that goes to the water nozzle to the toilet the rubber gasket there did the same thing that our cap did and bloat out I will provide a couple pictures as even when I cut the wires to the pump the rubber coating on it too is bloated just wondering what other damages there maybe....the new 10$ pump is a little smaller around so I made a foam sleeve to take up the space so it won't rattle around
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Might be the chemicals left in the tank? Or just plain old water for years, who knows. Drain it at the end of the year. And clean/flush out the holding tank at the end of the year. I only had the pup a few years but did that and chemicals only in the holding tank, and never had a problem. When I got it I had to blow out all the lines and really flush it feom the strands of hod knows what, almost looked like plastic flotting around in the tank.
rob.mwpropane
Active Member
- Aug 11, 2021
- 282
That's crazy. It's like 40x as big as it was?
popup-flyer
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Having read through this and seen some responses I want to say that the water pump/flush system is completely isolated from the toilet/waste system.
Is is not physically possible for that foam you found to have come from anywhere except the the flush water tank /fill plumbing or someone screwing with you.
I had the 402C and never saw anything like what rob pictured.
Is is not physically possible for that foam you found to have come from anywhere except the the flush water tank /fill plumbing or someone screwing with you.
I had the 402C and never saw anything like what rob pictured.
rob.mwpropane
Active Member
- Aug 11, 2021
- 282
I understand completely what you're saying and agree. I studied the crappy pdf for parts, I investigated all around... nada. The best anyone has come up with is the gasket on the fill cup. I had changed mine so that would sort of make sense.. I'm not 100% sold on that idea, but I haven't had any issues either.
I'm stumped
Ditto!
I worked in the quick oil change business for about 7 years out of highschool you should see what happens to a brake cap rubber if the fluid gets contaminated it will about double in size it's crazy here is just a quick look on the net for a picture
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rob.mwpropane
Active Member
- Aug 11, 2021
- 282
Mystery SOLVED... not really by me, but at least confirmed. I think @Michael J was the one who originally made the remark it came from the fill cap. For S&G I put the gasket inside the door and forgot about it, well low and behold here is that massive gasket! Shrunk back down. I added some original pics to compare...
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Mine shrunk too. And then I threw it in the trash. Might look for an o ring that fits, or might not. 
rob.mwpropane
Active Member
- Aug 11, 2021
- 282
Mine shrunk too. And then I threw it in the trash. Might look for an o ring that fits, or might not.
I had changed my cap (can't remember why, I think Thetford was nice enough to send me one?) so mine still had that o ring in there.. the ring had just been in the holding tank for who knows how long, lol. I don't see where it's really needed unless your tank is full and your on a steep embankment.. I could see a little water start to seep out... maybe... who knows.
I want you to keep your unit level, mister! And stay the hell away from all embankments and ledges.
What I would watch out for is where the water get pumped into the toilet the piece the hose pushes onto them it snaps into the ring from the inside and there is a o-ring there and that bloated the same as the cap and caused it to be loose and with vibration it all fell into the fresh water tank. Head off any problem and check it out may save from a headache later and is easy to fix with a small o ring
