Waterway hot tub pumps in the Executive 56 and Executive 48 series have motors that are thermally protected to extend the life expectancy of the motor and use a split capacitor to start and run for less energy consumption. They feature a Large 6 ½" diameter wet end for higher head pressure and energy efficiency with internal Silicone carbide seals, Viton bellows and 316SS casing that's corrosion resistance against chlorine, bromine & salt.