I have mine set at 55 psi. I was at one place in CA where the spigot pressure was 130 psi. It was while I was volunteering at Deukmejian Wilderness Park in La Cresenta CA. They were on a well pump for the entire park so it was set high.
I believe that the water system in our Monaco coach has been tested to 100 psi but I would never run it much beyond 60 psi.
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