HIGH COMPATIBILITY This rubber seal is compatible with 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. The gasket is made of high-quality rubber, which ensures high stability and reliability. It is resistant to harsh conditions in your RV's sewage system and helps solve sealing issues. OPTIMAL SEALING These seals provide a long-lasting and effective seal, reliably preventing leaks and unpleasant odors. They protect your motorhome's toilet system and ensure a clean, worry-free experience. 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 on hand to quickly address maintenance needs and maintain the functionality of your toilet system.