This is the 3rd pump that I have installed on my 1983 Karcher pressure washer with a 6 HP Honda engine. The first had an aluminum body, the second one was brass and lasted much longer, this one is brass and has an oil bath. I expect it to last much longer. This pump is adjustable and is more powerful than any pump that I had used in the past, I have to turn the pressure down to wash my cars, window screens, and much more, but the highest pressure is perfect for cleaning stubborn stains on concrete. The only drawback is that that although the mounting flange lines up with the engine it is difficult to tighten with any of the tools that I have because of the close proximity to the pump body.
EN 
Bill W. 
