The task of this key or screwdriver is to enable the person performing the maintenance of the blue gas tank to easily remove the internal valve The old Italian blue gas valve was replaced with a new valve, or as some like to call it, the gas valve.
You can also use this screwdriver to: Open nail breeze (The side screw of the blue gas tank) and retighten it again (this process is repeated with you often if you are one of the people who practice filling your tank without resorting to gas shops)
