I was looking for a way to avoid suck-back and oxidation when cold-crashing. I heard some people use a balloon, so I built this thingy. Balloon will be filled with co2 of course. I'm kinda proud of this device so I thought I'd share.
![IMG_20150906_184848.jpg IMG_20150906_184848.jpg](https://cdn.homebrewtalk.com/data/attach/256/256466-IMG-20150906-184848.jpg)
Spray plastic wrap with starsan and put it over mouth of carboy... I do this with every beer and have never had any issues.
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