Water Cannon offers a full selection of over 134 pressure washer replacement pump models from all major manufacturers, including Cat, AR and General Pump. They also carry tank feed models and continuous duty versions that can run 23.5 hours per day. Features include flow rates up to 58 gpm and adjustable pressure up to 6,000 psi. Pumps are complete, ready to use, and installed in 4 bolts. Water Cannon.