Campbell Hausfeld Pressure Washer,&nbsp;4000 PSI 3.5GPM&nbsp;Triplex Pump GX390 Honda (PW4070) Powerful and reliable Honda GX390 commercial-grade engine that is tough enough for any job Commercial 3.5 GPM Cat Pumps triplex pump with solid ceramic plungers; special high pressure seals. Finish your projects faster and easier with Campbell Hausfeld - The Air Power Expert Professional lance with quick connect tips. Steel, welded frame is powder coated for durability and pneumatic tires for easy movement. Includes quick-connect spray tips and high-pressure hose. 4,000 Max PSI, 3.5 Max GPM