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My bad. I should have said pressure reducing value for all my questions. 1) Could the new pressure reducing valve be bad? 2) Could my expansion tank be bad? It is reading 52 psi 3) Should I put an expansion tank on the hot side too? 4) Should I put another pressure reducing value after the...

I put in a new pressure reducing valve because the old on was going bad (2 weeks ago). When the water is being used during the day, it stays between 50 and 60psi. I left my pressure gauge on the supply line over a couple of days and at some point it reached 140 psi. On the cold water side, I...

what I have in the basement is a bathroom roughed in with the sink, toilet and tube in the concrete floor. There is a bathroom above this bathroom that is not vented trough the roof. it has a studor value under the sink. The studor vent is the only vent for the 1st level batch. The main...