This RMW2.5G28-EZ-SX plunger pump will pump up to 2.5 GPM at 2800 PSI. It spins at 3400 RPM in a direct drive system coupled with a gasoline engine. The matching flange provides convenient connection to most 7/8 in. shaft 1.1-5.5 HP engines. The hollow shafted pump includes a built-in pressure control valve, and chemical injection system.