Originally Posted by page.crow
Glad I roused this thread. I am looking at my setup and see NO check-valve around the 12v
water pump. (Is it internal on the Par pump unit?) So I am learning here that I can go ahead and install said check-valve AFTER the pump. AFTER instead of before to prevent shore water from pressuring into the pump and hold-tank. (Chuck?)
Did I say this correctly? I am running out now to buy a one-way valve. (or was that two one-ways or one two-way?) I'm gonna go find that Walmart regulator also.
Back soon. <grinning>
Your trailer originally had 2 check valves.
One was near the city water hookup. The other was at the output of the water pump.
The one near the city water inlet, stops water from flowing out of the trailer when you run your water pump.
The one at the pump, keeps the city water pressure off the the diaphragm and valves, keeps the water lines pressurized, and stops the city water from possibly flowing back thru the pump, which would overfill the water tank, which in turn would buckle the floor permanently, big time, like a coupe of inches.