4000 psi pressure washers http://www.daimer.com/Industrial-pressure-washe... With a flow rate of 4 gallons per minute (GPM) at a pressure of 2000 psi, this pressure washer can handle more difficult applications than more modestly priced models. The Super Max ® 12300 tri-mode model offers higher flow rate (5 GPM) and pressure (3000 psi).
