Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness Need both exterior pool ladder

Need both exterior pool ladder as well as interior steps

3 and 5 Pentair MasterTemp 400LP 400LP O-Ring Kit

rinse with clean water and return the cartridge to the filter

Ports accept 1-1/2" pipe inside and 2" pipe outside

Pentair Black O-Ring | Sta-Rite Posi-Flo II Cartridge Filters | WC9-3 Calcium Hardness Need both exterior pool ladderThe 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