Waterway 310-4180B Impeller Assembly Replacement for Waterway 56-Frame Executive Series 5-Horsepower Pool and Spa Pump Impeller assembly replacement Fits Waterway executive series 56-frame 5-Horsepower rated 230-volts and 16.4-ampere pool and spa pump Impeller is 30-percent glass-filled Noryl Includes vane with 5/8-inch wide opening Measures 4-5/9-inch outside diameter and 2-1/8-inch inlet inside diameter