Highfield MFG. Co. was founded in the heart of the New England metal-forming industry in Watertown, Massachusetts in the early 1930's. Known to our earliest customers as Morse-Smith-Morse, our business began with the design and manufacture of safety valves and security products for the New England Natural Gas Industry. The company's original design and patent for a barrel lock dates back to 1933, and our barrel lock and lock seal assemblies are considered to be the standard for valve security in the Water and Natural Gas Industries. Our FiromaticŪ brand of valves and accessories serves the fuel oil heat industry. Many of our valves carry the US and Canadian Underwriters Laboratory (ULŪ) listing and have a thermally actuated safety shut-off feature.