Ball Lock Corny Keg-Gas vs. Beer Post - Home Brew Forums

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Old 09-16-2009, 07:46 PM   #1
Aug 2007
Southern Maine
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Any sure why to tell the difference between the gas and beer posts on a ball lock keg?

I took my one and only ball lock keg apart awhile back and when re-assembled it, taking a guess on which post belonged on the Gas/In side and which post belonged on the Beer/Out side. I could not remember which post went where but also did not see any obvious differences between the two posts. Now I'm getting close to filling it and want to be sure.

I know the gas post and the beer post are supposed to be different...thanks for any help!

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Old 09-16-2009, 07:58 PM   #2
Nov 2008
Mount Prospect, IL
Posts: 152

i believe the beer out post will be about 1mm(or less) larger then the gas-in post.

(if you've ever accidentally put the gas-in on the wrong post it's a bit difficult to remove)
"Beer is living proof that God loves us and wants us to be happy." - Benjamin Franklin
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Old 09-16-2009, 08:01 PM   #3

Often, the gas post will have nicks in the fitting just below the o-ring.

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Old 09-16-2009, 08:01 PM   #4
Aug 2008
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Old 09-16-2009, 08:02 PM   #5
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Oct 2007
Portland, OR
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On all my kegs it is pretty clear what's what. The gas post will visually just look a little different. A notch here, a line there, etc. Something that makes it easy to tell (without having to measure 1mm).

Man I'm slow...

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Old 09-16-2009, 10:59 PM   #6
Jan 2009
Santa Clara, CA
Posts: 1,914
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Originally Posted by RC0032 View Post
Also, the gas connection on some kegs will be a 12-point fitting; these typically don't have notches, but you can tell by the 12-point (as opposed to the normal six-point) notches. Sorry, no pic handy.

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Old 09-17-2009, 02:44 PM   #7
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Feb 2008
Reed City, MI
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This would have been good to know before I pressed the wrong one on. I did manage to get it off again, but it was surprisingly difficult.
Day after day, it reappears. Night after night my heartbeat shows the fear. Ghosts appear and fade away. Come back another day.

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Old 09-17-2009, 02:45 PM   #8
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Dec 2007
Oconomowoc, Wisconsin
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This was the question that first brought me to HBT.... ahhhh single tear

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Old 09-17-2009, 02:51 PM   #9
Aug 2007
Southern Maine
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Thanks to everyone for your help! In looking at it again, I did remember that one of the posts had those notches, but I didn't know it the notch was for the gas or the beer. Now I know!

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Old 09-18-2009, 06:28 PM   #10
Oct 2008
Posts: 421
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Look at the first "ridge" down from the top of the post.
Gas In post have a small ridge. Liq. out post has larger ridge.

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