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 40Ð50psi. The pressure regulator attaches easily with 3/4 Ð 11-1/2" garden hose connections. The pressure is factory preset at 40-50psi. Patented. For Outdoor use only. Maximum incoming pressure is 125psi.