There have been a lot of problem with that valve assembly. While I was in Utah working for
Superior/The Olson's I think I counted 6 people in a 3 week span that either called, or brought in that tool for repair.
What you need to do is contact the distributor that sold the tool to you. They have made a better assembly for it. The only problem is the time you'll have without the tool. Your disty has to send it back to
Hydramaster/Cleanmaster, they have to fix it, send it back to your disty, and finally back to you. If you really like the tool then you'll want to consider this option, but be prepared to be without the tool for 2-3 weeks with all of the shipping time. The disty should be able to get a credit from
Hydramaster, and the repair
should be free.