Pentair 355604 Impeller Replacement Challenger High Pressure Pool and Spa Inground Pump Impeller replacement Fits Pentair Challenger high pressure inground pumps For 2-horsepower full rated and the 2-1/2-horsepower up rated Challenger pumps Measures 5-1/2-inch length by 2-1/2-inch height by 5-1/2-inch width