The Camco Brass RV Water Pressure Regulator with Gauge helps protect your RV or boat's plumbing and hoses from damage caused by high-pressure city water. It features an easy-to-read color-coded gauge. The pressure is factory pre-set at 40-50 PSI. The pressure regulator attaches easily with ¾-inch garden hose threads. Maximum incoming pressure is 125 PSI. Durable, lead-free brass construction is drinking water safe. For outdoor use only. Patented.