The Wayne Switch Genius submersible sump pump features new electronic switch technology that lasts up to 5 times longer than conventional switches. Designed for use in clear water applications only. U.S.A. Flow (GPH): 3,900, Volts: 115, HP: 1/2, Max. Total Head (ft.): 20, Suction Type: Top, Discharge Port (in.): 1 1/2, Impeller Shaft: Glass-reinforced polycarbonate No moving or mechanical parts means worry-free operation 1 1/2in. threaded discharge for high volume Heavy-duty oil-filled motor for lasting durability Top suction design reduces clogs and prolongs pump life No assembly required