Pentair 24206-0103S Air Release Valve Vent Stem with O-Ring Replacement Pool and Spa Filter Air release valve vent stem replacement Fits Pentair Sta-Rite PXC aboveground and Posi-Clear Cartridge filter system Also fits Pentair Sta-Rite System 2 Modular Media PLM and D.E. PLDE series filter model PLDE48 Includes O-ring Measures 4-inch length by 2-inch height by 2-inch width