WAYNE WSF50 1/2 HP Thermoplastic Sump Pump With Vertical Float Switch Top suction pump design eliminates air locks and clogging from debris in bottom of sump pit Corrosion resistant, sealed thermoplastic construction Fully submersible Max. Flow rate is 2900 gallons per hour; 2200 gph at 10 ft. Of discharge lift 1-1/2" npt discharge