Pentair 355068 Impeller Assembly Replacement Pool and Spa 3 HP Pump Impeller assembly replacement Fits Pentair Challenger high flow 3-horsepower pumps Also fits Pentair WaterFall pool and spa 3-horsepower pumps models AF-120, AFP-120 Measures 5-1/4-inch length by 2-1/2-inch height by 5-1/4-inch width