Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Drain & Suction Covers Nozzle interchangeability allows custom jet

Nozzle interchangeability allows custom jet placement

It’s an environmentally safe product that isn’t corrosive

Fitment for IntelliFlo i1 and i2 pumps is confirmed for units manufactured after April 2016

⚠️ IMPORTANT: Remove Pad Adapter Before Installing

Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Drain & Suction Covers Nozzle interchangeability allows custom jetThe Pentair WC9 3 is the OEM replacement black O ring for Sta Rite Posi Flo II pool and spa cartridge filters, keeping the filter housing sealed and operating at full efficiency. IMPORTANT: LUBRICATION REQUIRED SOLD SEPARATELY Always lubricate this O ring with a silicone based lubricant before installation. We carry the Pentair R172351 Lifeguard Silicone Lubricant the OEM matched product for Pentair equipment. This O ring maintains the pressure seal