A necessary piece of home beer equipment, home brew airlocks help to protect your beer from air, while allowing carbon dioxide to escape through the fermentation process. We sell a range of airlocks suitable for small batch brews of 1 to 5 gallons up to large-volume brews of 25 gallons to meet all your brewing needs. This is critical to preserving the flavor of your beer and preventing oxidation. Stock up on airlocks and related home beer brewing essentials, such as primary fermenters, from E.C. Kraus.