Pentair 355043 Impeller Assembly Replacement Pool and Spa 1/2 HP Inground Pump Impeller assembly replacement Fits Pentair Challenger, Pinnacle high flow pool and spa inground 1/2-horsepower pumps Also fits Pentair SuperFlo and Sta-Rite SuperMax pool and spa 1/2-horsepower pumps Measures 4-inch length by 2-1/2-inch height by 4-inch width