Gasket. Agitator 16, Agitator 18 Clean & Restore, Aquaclean 16St, Aquaclean 16Xp, Aquaclean 18Flx, Aquaclean 18St, Clean Track 16, Clean Track 18 Wash & Rinse, Clean Track 18, Clean Track L18, Clean Track S16, Convertamatic 21B, Hydro-Retriever 5000B-Hydro-Max Ii, Hydro-Retriever 5000B, Klenzor 16, Klenzor 18 Mph