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Question

Hi Tom, how do I replace the lip seal on my C3 Thetford toilet. It is an old model and I think it is different from the newer version.

Answer

Hi, yes the older version (produced before June 2000) of the Thetford C3 cassette is differennt from the newer one. Replacing the lip seal is equally as easy though. First you have to unscrew the 8 screws on the seal cover and, take the seal cover off. Follow the pictorial diagrams below to complete the task.