Pentair 355330 Strainer Pot Flange O-Ring Replacement Pool/Spa Pump, Filter and Skimmers Strainer pot flange o-ring replacement Fits Pentair Tagelus pool and spa sand filters Also fits Pentair Challenger high flow and high pressure pool and spa inground pump Compatible with Pentair WaterFall pool and spa pump and Admiral skimmers Measures 2-3/4-inch length by 1/4-inch height by 2-3/4-inch width