Specification: Maximum Volume: 4.5/5.6 gpm Max. Discharge Pressure: 3500 psi Maximum Pump Speed: 1125/1450 rpm Maximum Inlet Pressure: 125 psi Maximum Inlet Vacuum: 9 ft. water (7.9 in Hg) Bore: .787 in / 20 mm Stroke: .630 in / 16 mm Crankcase Oil Capacity: 40.6 oz Maximum Fluid Temperature: 165 Degrees Fahrenheit Inlet Port Thread: 1/2-14 BSPP-F Discharge Port Thread: 3/8-19 BSPP-F Shaft Diameter: .945 in / 24 mm Product Function Description: .