Article: You'll know that your keg is empty if you open the faucet of the tap and either very frothy beer comes out or none does. Some kegs will have a CO2 tank that provides pressure inside the keg to help dispense beer. The gas also helps the beer hold its natural carbonation. If the system you're using has a CO2 line, turn it off. Grasp the coupler and rotate it counter-clockwise until it won't move anymore, usually just a half-turn.
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Check to make sure your keg is empty. Look to see if your keg has a CO2 line. Lift the coupler handle at the base of the tap where it joins the keg. Pull the coupler off the empty keg. Move the empty keg aside.