Firebreak device

A firebreak device configured to arrest a flow of medical gas capable of combustion or of supporting combustion, said device comprising:

• a housing having a body portion, an inlet and an outlet, said inlet and outlet being linked by a conduit;
• a valve assembly located within said body portion, said valve assembly being movable between an open position, in which gas can flow between said inlet and outlet along said conduit, and a closed position in which gas flow between said inlet and said outlet is arrested;
• a biasing assembly arranged within said body portion to move said valve assembly into said closed position;
• and
• a heat activatable stop located between said biasing assembly and said outlet to hold said valve assembly in said open position against said biasing assembly, and adapted to release said valve assembly to allow said biasing assembly to move said valve assembly to said closed position at an activation temperature, to close flow of gas through the device if said heat activatable stop is activated;
• and said heat activatable stop is arranged to prevent obstruction of said flow of gas adjacent an inner surface of said device;
• and wherein
• said inner surface of said device includes one or more elongate burn rib formed on said inner surface of said device, said burn rib being located between said heat activatable stop and said outlet, and said elongate burn rib has its elongate dimension arranged to extend along the inner surface in an axial direction between said heat activatable stop and said outlet.