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These S-shaped airlocks are the classic design, used for years by winemakers. Fill them to the fill line and affix to your fermenter of choice. Positive pressure from fermentation will allow CO2 to escape through the water without allowing oxygen or contaminants into the vessel. These also make great airlocks for food fermentation or secondary fermentation of beer.

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Great airlocks!
These airlocks work like a charm. (Best to have a couple of new ones as backups because eventually they will crack.)
Jul 18, 2017  |  By Tim Jorgensen