many RVers uses a short length of hose like a washing machine hose to a "Y", with one other end to a pressure guage, the other to an adjustable house regulator then to a whole house sediment filter, then the hose to the boat.
This lets you adjust the pressure to what you want and trap any crap that may have been in the dock lines befor you got there. The whole setup is compact enough to fit into a milk crate with your supply hose and costs less than $100 or so.
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