The K2 Pumps Water Powered Back-up Sump Pump is designed for use as an auxiliary sump pump in the event your primary sump pump fails. The pump is powered by municipal water pressure and requires a connection to your city water system with a minimum pressure of 40 psi. The pump removes up to 573 GPH of water at 0' of lift at 40 psi and 702 GPH at 60 psi. The compact design can be used alongside any sump pump basin 18" in diameter or larger. 1-1/4" MNPT Discharge and 3/4" Inlet.