Divers with a decompression injury
Suspected internal injury
Warning signs of serious illness
Serious mechanisms of injury
The type of oxygen delivery device or mask
The ability of the oxygen first aid provider
Oxygen flow rate
The seal of the mask around the person’s face
Briefly open and close the cylinder valve.
Examine and insert the gasket.
Attach the regulator to the oxygen cylinder.
Pressurize the system and check for leaks.
Depressurize the regulator.
Use a sealing gasket specified by the regulator manufacturer.
Open cylinder valves slightly before attaching regulators to expel foreign matter from the valve’s outlet port.
Visually inspect sealing gaskets for damage before use.
Be sure the valve, regulator, and gasket are free from oil or grease.
Never use wrenches or tools to tighten the regulator to the cylinder. This could damange the gasket. Hand-tighten only.
Open the cylinder valve slowly. If a leak is heard, quickly close the valve. Verify that the regulator is properly attached and that the gasket is properly placed and in good condition.