Oxygen Mask

A device consisting of a facepiece which partially covers the face, having a breathing tube and a coupling for connecting to a regulated supply of oxygen. The device may be of the rebreathing type or of the demand type and may be used for rescue operation or to supply the wearer with oxygen when flying at high altitudes. It may include regulating devic (s) but does not include oxygen cylinder(s) . Excludes mask, oronasal.