Pentair Water Master Plumber 176951 1/2 HP Cast Iron & Zinc Sump Pump With Vertical Switch features rugged Heavy Duty Cast Iron Volute, & Smooth Flow Hydraulics and Corrosion Resistant Zinc Motor Housing for heavy duty applications with an energy-efficient motor that is thermally protected against overload. 1-1/2" Discharge Pipe Size, Vertical on/off float switch can be used in smaller sump basins. Smooth Flow Hydraulics, delivers high performance for demanding applications. Horse Power: 1/2 HP; Maximum Pumping Capacities To 4,700 Gallons Per Hour Performance; Cast Iron base, provides strength and durability for years of use Zinc motor housing, dissipates heat quickly and extends motor life Smooth Flow Hydraulics, delivers high performance for demanding applications. 8' Power Cord, Vertical Float Switch Can Be Used In 10" Diameter Or Larger Sump Basin, 2 Year Warranty.