Camco's Plastic Water Pressure Regulator helps protect your RV and boat plumbing, and hoses from damage caused by high-pressure city water. It reduces the water pressure to a safe and consistent 40 to 50 PSI of operational pressure. The regulator protects appliances and plumbing fixtures and prevents hose failure to help prolong equipment life. The water pressure regulator is easy to use and attaches to 3/4 inch garden hose threads. For outdoor use only. Maximum working pressure is 125 PSI.