Correct diameter tube/shank for beer gas

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Hi all, I'm adding a stout faucet to my kegerator, and was curious if it is better to use 1/4" or 3/8" ID tubing to connect the keg to the shank/faucet. I have 5-foot lines running my current kegs to my taps, with the taps about 2.5 feet above the kegs.