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We rent a couple r-12 Aquatrax from our shop. The exhaust outlet elbow right above the jet pump melted twice now. I blew out every water line and didn't find anything that stood out at me. Finally, I pulled the exhaust pipe that goes into the waterbox to check that. There is a water outlet hole down at the bottom of it that was plugged with sand/crud. I had to take the 17mm plug out of the bottom and blow it out. I also made the hole a little larger. If you ever have this problem now you know what to check.:appl: