The thetford cassette lip seal, Thetford part number 23721, this seal should be compatable with the C200, C2, C3 and C4 model cassette toilets produced after the 15th of June 2000. If you are not sure please refer to your toilet manual where the part number should be listed.
Please be aware that the use of domestic toilet cleaners can be detrimental to the lip seal in your toilet, Thetford have a range of 'seal safe' cleaners available.
