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Hi my name is Robert.....
No more then 55 psi.... The regulator will regulate the water to around 45 psi... One thing to check is all the screens in the faucets if you have not done so, unscrew the ends and make sure the screens are not plugged up at all. Also if you have a water filter I would change that out as well if you have not done so not sure if yours has one or not..... Hope this helps some..... Robert