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Not every campground hookup plays nice with RV plumbing. Some parks run city water pressure well above what your lines, fittings, and water heater are built to handle, and that's how you end up with a soaked underbelly or a split hose. This brass regulator installs at the spigot and holds output in the 40-50 PSI range automatically, so you don't have to guess or babysit it.
It's a cheap bit of insurance that installs in seconds and stays on the spigot end of your fresh water hose for the whole trip.