Don't know yet. The drain pipe is clogged with the stuff and a I'm hoping a little bit of kerosene will loosen it up and then a shot of air pressure will clear it out. Gonna do that one out in the gravel driveway. The pumps are nice, but I didn't use the one on the other parts washer very much. I did find some Buick rocker shaft bolts in one corner. They were pretty clean when I took em out.