The cheap so called RV water pressure reducers are really flow restrictors which as a byproduct reduce the pressure. I always add a residential Watts water pressure regulator just inside of the city of the city water connection. This controls the pressure without reducing the flow. The two devices are built differently.
The check valve in water pumps frequently fail. You can always replace the pump. You could also add a spring loaded check valve between the water tank and the pump. Shark Bite makes one that will slip right over PEX piping. These can be bought in most box stores that carry plumbing parts or hardware stores.
I tend to add cutoff valves on hot/cold lines to most every fixture in our RVs. That way if/when something blows I can isolate that one device until I can fix/replace it. I've also added several extra check valves to prevent other problems. Most OEM RV check valves are plastic- what's new about that. Residential stuff is frequently brass and will last better.
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Fred & Denise (RVM157) New Mexico
2007 Excel Classic 30RSO & 2015 Mini Winnie 22R
2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB
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