Firomatic 3/8" FPT Inline Check Valve

The check valves are used to prevent ‘back-flow’ in fuel oil lines. They have Viton® equivalent seal. Features: Fusible valves approved for kerosene and No. 2 fuel oil High quality brass design with standard handwheel closure at 165°F ambient temperature Valves are listed by Underwriters Laboratories for U.S. and Canada, conform to UL 842 standard as a Manual Valve Multiple Fire Safety Valves are required by NFPA 31 code and CSA B139-15 on all installations