Pentair 272541 O-Ring Replacement Pool/Spa Filter and Valve O-ring replacement Fits Pentair Six-Way 1-1/2-inch HiFlow and top/side mount pool and spa multiport valves Also fits Pentair Sand Dollar and Sta-Rite Cristal-Flo II high rate pool/spa sand filter Also compatible with Pentair Tagelus pool and spa sand filter models TA 30D, TA 35D, TA 40D, TA 50D, TA 60D Measures 4-3/4-inch length by 4-3/4-inch height by 1/4-inch width