O2 cylinder wrench is small a device used open and close the O2 tank. The wrench is attached to a PVC strap which should be attached to the post of the tank to reduce the risk of misplacing.
The O2 Airway Kit contains 425L of oxygen and is designed for any environment in which a patient may unexpectedly experience a medical emergency where oxygen is needed. Extra equipment must also be on-site to deal with the emergency efficiently. The job of an O2 Airway Kit is to contain both the oxygen and the equipment required to treat a patient for the first thirty minutes or so of a medical emergency.
This is used as physical barrier to prevent the victim's breath and body fluids from reaching the rescuer. One-way valve and directional diaphragm prevents back-flow of air and contaminants.