A fire coupling (10) for medical gas for use with flexible intubation that supplies medical gas that can combustion or withstand combustion, said coupling (10) comprises: an elongated body (100) having an opening (20) in the region of each end, said openings are connected by a conduit (30)； a valve assembly (130) located within said elongated body (100), said valve assembly is movable between an open position, in which gas can pass between said openings (20) along said conduit (30) , and a closing position in which the flow of gas between said openings (20) is prevented； a predisposition assembly disposed within said elongated body (100) to move said valve assembly (130) to said closed position； and a heat activatable stop located between said predisposition assembly and the region of each end of said elongate body, operable to hold said valve assembly (130) in said opening position against said predisposition assembly, and adapted to release said assembly valve (130) to allow said predisposition assembly to move said valve assembly (130) to said closed position at an activation temperature, to close the gas flow through the coupling (10) if said heat activatable stop it is activated at any end of the coupling (10),Un acoplamiento contraincendios (10) para gas médico para uso con entubación flexible que suministra gas médico que puede combustionar o soportar combustión, dicho acoplamiento (10) comprende: un cuerpo alargado (100) que tiene una abertura (20) en la región de cada extremo, dichas aberturas se enlazan por un conducto (30)； un conjunto de válvula (130) ubicado dentro de dicho cuerpo alargado (100), dicho conjunto de válvula es movible entre una posición de apertura, en la que puede pasar gas entre dichas aberturas (20) a lo largo de dicho conducto (30), y una posición de cierre en la que se impide el flujo de gas entre dichas aberturas (20)； un conjunto de predisposición dispuesto dentro de dicho cuerpo alargado (100) para mover dicho conjunto de válvula
