Erie Tools triplex 1-inch hollow shaft pressure washer pump for Cat General AR. This pressure washer pump has a forged brass manifold and features a reinforced pop off valve and a ceramic-coated plunger. The Erie Tools 1512A offers a 5 GPM flow rate and a maximum pressure of 3,200 PSI (220 BAR). This pump requires an input of 3,400 RPM and 13 HP.