How do I repair the "trap door" on my Thetford Toilet Cassette?
We are experiencing problems with the actual cassette in that the "trap door" does not always open or close. Is this something that can be repaired or can we purchase just that part of the cassette. Is this a common fault or is there something else that we need to perform as we have only used our caravan for the first time, albeit it is only 3 years old.
Maz, June 2010