An oxygen administration apparatus comprises a source of oxygen 2, an oxygen administration device 6, a flexible oxygen-conducting tubing 4 connectable at one end to the source of oxygen and an other end to the oxygen administration device 6. The connections are made through firebreaks 10 and 12. The firebreaks 10 and 12 are valves that both contain a fusible stop. In the event of a fire taking hold along the tubing 4, it travels back rapidly towards the source of oxygen 2. The resultant heat will cause the stop of the firebreak 12 to fuse, thereby closing off the supply of oxygen to the fire. If a fire takes hold downstream of the firebreak 10 then similarly the firebreak 10 closes off the supply of oxygen to the fire. The firebreaks10 and 12 both have connecting ends of different configuration. The firebreak 10 is of different configuration from the firebreak 12.
