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Thread: CO2 line size

  1. 10-12-2009 11:57 PM #1
    jsbrugg
    jsbrugg is offline Member
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    Default CO2 line size

    From everything I've been reading on here - and what the local homebrew store told me - gas line is 5/16". I was at an estate sale last week and picked up a bunch of old draught beer equipment and fittings and one of the items in the batch was a three-port brass manifold with 3/8" flared brass check valves in it. It looks like a 3/4" hex shaped piece of brace with a 1/2" male inlet on one end. I also got a new looking secondary regulator from NADS that has two of that same size check valves attached, along with a 1/2" threaded nipple. The barbed connectors that were attached to the check valves on the regulator are only 1/4" and easily slip in and out of a 5/16" gas line. It seems that I'm asking for a leaky connection if I try to use that size connector with the 5/16" line. The connectors fit inside of a nut that attaches to the flared check valves, much like a smalle version of a tailpiece.

    Is it OK to use a smaller line for CO2 or will the 1/4" tailpiece work, or should I get another tailpiece?

    In my haul, there were a ton of fittings - connectors and tailpieces of all sizes. Is there a reference guide somewhere that explains what all of the different sizes are used for? Also, does the closer spacing of the barbs indicate stainless steel?
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  2. 10-13-2009 07:29 AM #2
    cubby_swans's Avatar
    cubby_swans
    cubby_swans is offline Super Moderator
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    co2 line size doesn't make a difference. As long as it fits on the connections without leaking.
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  3. 10-17-2009 09:40 AM #3
    jtrainer
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    I used 3/16 inch beer line for both beer AND co2 as do many other homebrewers do. Just makes having spare for reconfigs fast and easy.
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