Honeywell Pressuretrol Limit Controller, 10-150 PSI Operating Pressure Range, Manual Reset, SPST Switch Breaks on Pressure Rise, Stainless Steel Diaphragm, For use with Steam, Air, Noncombustible Gases and Non Corrosive Fluids, 1/4″ Internal Thread or Surface Mount through back of Case, 120Vac/240Vac