Christopher
Moderator
If nozzles are not positioned correctly, the surface cleaner will vibrate and disbalance, spray bar will not spin as fast as it supposed to, there will be circles left on the concrete. At least this is what happened to me. Ball valve is ok to rinse, but 40 nozzle does a lot better job in my opinion. If you use the ball valve, non-fully open to run pressured flow through it, it will not last for too long. High pressure ball valves are not cheap ($30 and up). The one I see on the pic above looks like a regular ball valve.
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That is how mine is setup also but I use a tennis ball with a string through it to hold the trigger open, the string is through the tennis ball so when it falls, I don't have to chase it down the road, it just hangs there.