With Nozzle A (High Flow) this pump will operate between 40 and 54 PSI with the following flow rates (GPM) based on the lift height from the foot valve to the pump. 5FT - 20.2 GPM | 10FT - 17.4 GPM | 15FT 14.6 GPM | 20FT 10.8 GPM | 25FT - 7.0 GPM.