It is hard to tell just by looking, but they are slightly different sizes. The beer side is slightly bigger so you won't accidentally put your gas fitting on the beer post and flood your regulator with beer. However, if you push hard enough it can still happen so be careful.
This came to me without a gasket. I had one that was the right size so no big deal, but when connected to the coupler, it leaked continuously from the bottom connection. I tried re-adjusting several times but with no luck. I was using this so I could connect my beer gun to a sanke style keg coupler for canning.
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March 8, 2023
Rated 2 out of 5
It was very difficult to put the ball lock on this, and the adapter leaks CO. Would not buy again.
This adapter is great and lets me easily swap between my homebrew kegs and commercial kegs. However- as one of the other reviews mentioned you really need to be careful to not over-tighten it. The washer provided is really not good and deforms easily.
I'm not always going to be the one operating it and I didn't want to chance someone over-tightening it and losing a bunch of beer. I replaced it with another washer I had laying around the house and it works much better. I just wish it came with a better washer to start.