Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Drain & Suction Covers Each pump requires two (2)

Each pump requires two (2) of these unions — one on the suction side and one on the discharge side

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

Built in cup holder

Nozzle interchangeability allows custom jet placement

The weir is the hinged flap at the skimmer throat that allows surface water and debris to flow into the skimmer basket while preventing collected debris from floating back into the pool when the pump cycles off

Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Drain & Suction Covers Each pump requires two (2)The 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