Liberty Pumps SJ10A 1-1/2-Inch Discharge SumpJet Water Powered Back-Up Pump with Alarm At an inlet water source pressure of 60 PSI and a head length of 4-Foot this model pumps 19.8 GPM Accepts 20PSI up to 100PSI inlet supply pressure 3/4-Inch NPT water inlet connection accepts pex, copper or CTS CPVC 3/4-Inch line UPC approved (IAPMO PS 119-2005) Built-in screen with removable-Foot valve