The Comet Pump, VRX2527G-7, 2700PSI@2.5GPM (6511.0033.00) comes assembled with the items required to replace your old 7/8” horizontal pressure washer pump. It is pre-filled with oil and features a built in unloader and chemical injector to get your pressure working like new quickly and effectively. This pump is made of quality parts such as brass head and valve covers, stainless steel plungers, aluminum crankcase (without the need to replace oil), built in easy start, and a built in shaft key.