Rugged cast iron base and corrosion-resistant zinc body for heavy duty applications with an energy-efficient motor that is thermally protected against overload. Vertical on/off float switch can be used in smaller sump basins. Cast Iron base provides strength and durability for years of useZinc motor housing - dissipates heat quickly and extends motor lifeStainless steel fasteners and hardware for long lifeSmooth flow hydraulics delivers high performance for demanding applicationsPerformance (GPH) 0'=4,700, 5'=4,200, 10'=3,540, 15'=2,820, 20=1,800