Series N360, N360I Vacuum Relief Valves are designed for automatic venting of closed systems to atmosphere when a vacuum is created. The N360 permits air to enter and prevent vacuum conditions that could siphon the water from the system, resulting in collapse of a tank or water heater or equipment burn out. They consist of a brass body construction and a low profile design. Series N360, N360I can be mounted in a horizontal or vertical position and are tested and rated to ANSI Z21.22, and are CSA certified. Model N360 comes with 1/2 in. or 3/4 in. male NPT connection. Model N360I comes with 3/4 in. MNPT x 3/4 in. FNPT connections. Maximum Steam Working Pressure: 15psi (103 kPa).