Specification: Max Volume 4 Gallon Per Minute Max Discharge Pressure 4000PSI Max Pump Speed 3,400 RPM Adjustable Unloader Shaft 1" Hollow Max Horsepower 13.75GPH Max Fluid Temp 140 Degrees Soap Injector Inlet Port 3/8" FPT Outlet Port 3/8 NPT, also equipped with female disconnect. Feature: BRAND NEW PRESSURE WASHER PUMP. Package Including: 14000 PSI Pressure Power Washer Pump 4.0 GPM 1 Hollow Shaft Water Pump.