CDU800 CAST IRON SUMP PUMP 1/2 HP WAYNE | 1/2 hp cast iron and coated steel submersible sump pump. Assembled in the US with foreign and domestic parts. Float switch tested to 1 million cycles. Top suction design eliminates air locks and clogging from debris in bottom of sump pit. Epoxy-coated steel motor housing and rugged, cast iron base. Fully submersible. 1/2 hp, max flow rate is 4200 gph at 0 ft 1-1/2 in NPT discharge. For use in 11 in Dia or larger sump basins. 9 in ON level and 4 in OFF level.