Pentair Sta-Rite 11" Black Cartridge Filter O-Ring for Posi-Flo II | WC9-3 Pool Season Stain & Scale restoring your pool filter’s functionality

restoring your pool filter’s functionality

leading to significant energy savings

If your Sensor Plate uses bent tabs then you will need the Black Sensor Assembly

It uses larger nozzles for a larger cleaning range requiring fewer cleaning heads than the competitors

Pentair Sta-Rite 11" Black Cartridge Filter O-Ring for Posi-Flo II | WC9-3 Pool Season Stain & Scale restoring your pool filter’s functionalityPentair Sta Rite 11" Black Cartridge Filter O Ring for Posi Flo II WC9 3 OEM Pentair Sta Rite 11" black cartridge filter O ring for Posi Flo II PTM series and PTM135 filters. Helps restore a proper tank seal. Features Genuine Pentair Sta Rite replacement cartridge filter O ring. Fits Posi Flo II PTM50, PTM70, PTM100, and PTM135 series filters. Black O ring design for tank sealing service. Also referenced for separation tank assembly use. Direct OEM