Master Plumber 176951 Cast Iron & Zinc Sump Pump with Vertical Switch, 1/2 HPMaster Plumber 1 2 HP Cast Iron and Zinc Sump Pump features 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. Smooth Flow Hydraulics, delivers high performance for demanding applications. Horse Power: 1 2 HP Gallons Per Hour: 4,700 GPH Vertical switch Cast Iron base, provides