1/2 HP iron and oily steel warship sump pump. in the US with tramontane and domesticated parts. switch tested to 1 million cycles. lie suction design air locks and clogging from debris in bottomland of sump pit. Epoxy-coated steel motor and craggy, cast iron base. Fully. 1/2 ; max flow rate is 4200 GPH at 0 ft. 1 1/2 in. NPT. For in 11 in. or larger sump basins. in. ON and 4 in. OFF.