What pressure washer has the highest pressure?

The pressure washer with the highest pressure is the General Pump GP5500HD, with a maximum pressure of 5500 psi (38,000 kPa). This pressure washer is powered by a 13 HP Honda GX390 engine and has a flow rate of 4 GPM (15.1 L/min). It is designed for heavy-duty cleaning applications such as removing paint, graffiti, and grease from concrete surfaces.