Remove the air tank by rotating it counterclockwise.
Do not pull the trigger or jostle the gun, there will still be pressurized air inside the gun that could be expelled and cause bodily harm if injected into eyes and/or skin.
The pressure gauge will indicate the leftover air in the gun.
Pressurized air can be forceful, causing particles to be ejected from the gun into your eyes and/or skin. When air bubbles enter the bloodstream, they can block blood vessels, causing embolisms. To avoid this, make sure to point the gun in a safe direction when pulling the trigger because air will be released from the gun.