Quote Originally Posted by dj1 View Post
I have a rental in a hilly area, where the street water pressure is extremely high. According to the dept of water & power rep, sometimes it reaches 300 psi, causing pressure regulators to go crazy. I replace the regulator/reducer every few years. Hard to imagine pressure this high. But can you imagine having pex?
I can see that PEX would be a problem in this situation. If the regulators are unreliable and fail on the side of overpressure... ouch. You almost need a pressure-activated valve: if the pressure exceeds a certain amount, the valve closes and must be manually reset. Don't know if such a thing exists; maybe I just invented it! Be sure to put my name on the patent application.