Sorry no pics, but the water supply on my Minuet came in the back, elled into a line that had a pressure regulator and a check valve before the line continued on to supply the water to the fixtures and water heater. The check valve was to keep the water from dribbling out when using the on board pump while the pressure regulator was to protect from high pressure connections when at a campground or tied into city source.
While pex is good for distribution, the check valve - pressure regulator assembly is heavy enough that I left it in copper for strength.
1978 Argosy 6 Metre Minuet
2006 Toyota Tacoma