Pressuretrol Limit Controller, 2-15 PSI Operating Pressure Range, Manual Reset, 2 SPST Switches Break Simultaneously 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