WAYNE CDU1000 1 HP Submersible Cast Iron and Stainless Steel Sump Pump with Integrated Vertical Float Switch - 58321-WYN2 Top suction pump design eliminates air locks and clogging from debris in bottom of sump pit Stainless steel motor housing and rugged, cast iron pump base Fully submersible 1 hp; max. maximum flow rate is 6100 Gallons Per Hour, 5100 GPH at 10 feet of discharge lift 1-1/2" npt discharge Assembled in the US with foreign and domestic parts.