Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness replacement filter cartridge engineered for

replacement filter cartridge engineered for Caldera Spas systems

Frequently Asked Questions (FAQs)

cycle the filler through a full fill sequence and confirm the valve seats and stops flow cleanly at the set water level

rated at 10A 250V

rinse with clean water and return the cartridge to the filter

Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness replacement filter cartridge engineered forThe 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