Pentair 35505-1423 2-318 O-Ring Parker Replacement for select Sta-Rite Pool and Spa Filters (Discontinued by Manufacturer)

This 2-318 O-ring parker is designed to use with Sta-Rite System 3 Modular Media SM series pool and spa cartridge filters model S7M120, S7M400, S8M150, S8M500 and also compatible with Sta-Rite System 3 Modular SMD series pool and spa D.E. filters. Fits with Sta-Rite System 3 SD series pool and spa D.E. filter model S7D75, S8D110 and also fits with Sta-Rite System 3 SS series pool and spa sand filters model S7S50, S8S70.