The length is going to depend on other variables such as type of beer, temperature co2 pressure, etc. If this is an existing setup, you will find that the 3/16 line you likely have will easily go on the 1/4 barb for your corny.
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Malt is the soul of beer... and yeast gives it life..
but the kiss of the hop is the vitality of that life!
My three favorite beers: The one I just had, the one I'm drinking now and the next one I'll have.
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