Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to change a keg [title] Check to make sure your keg is empty. [step] 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. [title] Look to see if your keg has a co2 line.

Ending1: [step] 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. Ending2: [step] Some kegs are already empty if they're not quite full and only water is still left, but with a 2 " co2 line usually there will be a " co2 " somewhere on the keg. Also check your keg's fill line first. Ending3: [step] The co2 line is a blue line just below the bottom of the keg with co2 in it. The co2 line is a little thicker than the co2 line because as you water the keg, it moves into the co2 line. Ending4: [step] If a bucket of beer floats up in the middle of the keg, that means your keg is filled. Some liquids stick to the " co2 " line.

Answer format: ending1/ending2/ending3/ending4