Camco Brass Water Pressure Regulator with gauge helps to protect the RV and boat plumbing and hoses from damage caused by high-pressure city water. It features and easy-to-read gauge. Green on the color gauge indicates that the regulated pressure is between 40–50psi. The pressure regulator attaches easily with 3/4 – 11-1/2" garden hose connections. The pressure is factory preset at 40-50psi. Patented. For Outdoor use only. Maximum incoming pressure is 125psi. Helps protect RV and boat appliances, plumbing fixtures, and hoses from high-pressure city water Attaches easily with 3/4" garden hose threads Durable lead-free brass construction that is drinking water safe Easy to read gauge indicates the regulated pressure Compliant with all federal and state level low lead laws.CSA low lead content certified to NSF/ANSI 372