You get a pack of 20 Firesafe!
 
Firesafe check valve. Ensure - that at least two Firesafe valves are connected to each oxygen line. The first should be near the oxygen source and the second should be positioned near the patient.
 
The Firesafe check valve offers no protection - if a fire burns through the upstream oxygen lines of the device.
 
Can be used bi-directionally
 
Manufacturer number BPR: 827-2001
Manufacturer number: DEVI 827-2001-20