Milwaukee 3,750 PSI 13 HP Honda GX390 Gas Powered Pressure Washer 4555-22 13 HP GX390 Honda Engine; 3750 PSI, 4.0GPM; Large 12" semi-pneumatic tires with steel rims and quick-removal axle design Extended run-time 3.5 gallon custom fuel tank for 4 hours of continuous run time; Heavy-duty zero gravity roll-cage hand truck design with 1.5" steel tubing and quick release, fold-down handle Industry leading AR RKV series triplex plunger pump with solid ceramic pistons, EZ start, secondary pressure relief and thermal relief valve, pressure flow control, large DURAVIEW inlet filter with sight glass. Double-insulated engine base plate design for maximum vibration absorption. Fine dosage chemical metering valve, conveniently located on control panel.