Water pressure regulator

An RV water pressure regulator threads onto the freshwater hose between the campground spigot and the RV's inlet, stepping down incoming pressure to a safer level, typically around 40 to 50 psi. RV plumbing, fittings, and the water pump are built for lower pressure than typical municipal or well systems, and unregulated pressure is a common cause of split hoses and leaking fittings.

Campground water pressure varies enormously between parks and even between spigots at the same park, and it is not something you can judge by looking at the tap. A regulator removes the guesswork by capping pressure automatically regardless of what the source is putting out.

The most common mistake is skipping the regulator because a hookup looks fine, only to discover a slow leak or a burst fitting later. An inline regulator is inexpensive relative to the plumbing damage it prevents, and pairing it with a pressure gauge lets you confirm it is working as expected.