4000 PSI @ 4.0 GPM Horizontal Gas Engine Triplex Plunger Replacement Pressure Washer Pump 21 inch Emax Compressor we use only The heavy duty machined Emax Compressor we use only the best German and Finland name brand airends direct drive 1750 RPM on all models 1 Max PSI 4000 MaxBar 275 Power EBHP 11 Bore Dia mm 18 Stroke mm 12 Crankshaft ID Stamp 4 Inlet 1 2" F Outlet 3 8" F Max Temp 140° F Oil Capacity (oz) 15 Weight 20 RPM 1750 Shaft Size 25mm Shaft Version J Annovi Reverberi AR RKA4G40HJ F22 horizontal gas engine triplex plunger pump is rated up to 4 GPM at max 4000 PSI spins a 25mm solid shaft at 1750 RPM using a 1 2”F inlet thread and 3 8"F discharge thread