Darlly 10200 FC 1403 C 9483 PJ200S 4 Spa Pool Filter Cartridge pooltool Seal PS 1904 shaft seal is Seal PS 1904 shaft seal is designed for compatible 3 4 inch shaft pump applications that benefit from a premium silicon carbide sealing interface The Raypak refractory retainer kit is designed for compatible 403 and 405 heater applications where the supported hardware that secures the refractory material needs replacement the filtration side of the system can no longer perform as confidently as it should This type of replacement is especially useful when the filter housing and related equipment remain serviceable and the issue is centered on the cartridge itself