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Sep 25 at 12:05 comment added Ecnerwal Code (both IPC&UPC) does not require a PRV when the system supplying the water is not at pressures above 80 PSI. Safety tends to go with code.
Sep 24 at 16:23 comment added divB Possibly reasons could have been safety, redundancy, code requirements (but none for existing homes) etc. But great to hear I can leave it out. I have a thermal expansion tank at the water heater. So will just proceed with the check valve
Sep 24 at 14:43 vote accept divB
Sep 24 at 10:54 history answered Ecnerwal CC BY-SA 4.0