Pentair 35505-1272 Buna-N Parker O-Ring Replacement Sta-Rite Multiport 1-1/2-Inch Pool and Spa Valve Buna-N parker o-ring replacement Fits Pentair Sta-Rite multiport side mount 1-1/2-inch pool and spa valve Also fits Pentair Sta-Rite multiport top mount 1-1/2-inch pool and spa valve