Great pump! Easy to install. 4 bolts secure this to the gasoline engine. Bolts hole match perfectly to my Honda GX 200, 2001 vintage. Pump has variable pressure knob to move from 2700 to 3300 PSI. The new unit comes with oil in the system. Also has detailed 20 page manual to walk you thru. The installation and operation. Even came with 6 new O rings. Highly recommend. A new replacement washer is about $670. The pump retails for $135, and it’s a much better pump than the original pump.