evldave said:Not sure if this would help, but standard RVs use a pressure reducer so that regular water pressure doesn't blow out the plumbing in trailers. You might be able to include this at the inlet for shore water to reduce pressure so a hand pump wouldn't get blown up by it (might take some tinkering).
If you can't work out a dual system, my vote would be put something together for a portable water container over shore or pressurized system. My 2 cents![]()
Any method of using city (shore) water would necessitate a the pressure regulator.
What I was trying to say above is that I don't think you're going to be able to have a single faucet serve as a hand pump for portable water AND work for city (shore) water.