Give new life to your old pressure washer and save money with high-quality replacement pumps and parts from Water Cannon. A full selection of over 134 models is available from all major manufacturers-Cat to AR to General Pump. They also carry tank feed models and continuous duty versions that can run 23.5 hours per day. With flow rates up to 58 gpm, and adjustable pressure up to 7,000 psi, all pumps are available complete and ready to use, with 4-bolt installation. Water Cannon.