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Campground water pressure is unpredictable, and running it straight into your RV's plumbing is a good way to blow a fitting or a fresh water line. This regulator is built from lead-free brass and preset to 55 PSI outlet pressure, protecting your water lines and pump while still giving you the highest flow this style of regulator offers.
Thread it onto your fresh water hose before it reaches the rig and stop worrying about pressure spikes damaging your plumbing.