HIGH COMPATIBILITY This rubber seal Thetford cassette toilets and fits models C200, C250, C400, C2, C3 and C4 (from June 2000). NOTE - Genuine part number 23721 - please check the part number before purchase to ensure compatibility. High Quality Material The gasket is made of high quality rubber, which ensures high stability and reliability. It is resistant to the harsh conditions in your RV's sewage system and provides a good solution to tightness problems. OPTIMAL SEALING These seals provide a long-lasting and effective seal and reliably prevent leaks and unpleasant odours. They your motorhome's toilet system and ensure a clean and worry EASY INSTALLATION Installation is simple and requires no special tools. Simply remove the old seal and insert the new one - your cassette toilet is ready to use again. PACKAGE INCLUDES - Set of 2 Black Rubber Gaskets - Ready to Use We recommend having a replacement kit ready to respond quickly to maintenance needs and maintain the functionality of your toilet system.