When it comes to fermentation, the key is to keep the oxygen away. This rubber stopper may look pretty simple, but it plays a very big role within the process. Constructed from a solid rubber material, this stopper features a perfectly sized hole to fit an airlock. Simply insert this stopper into the mouth of your fermenter or carboy, add the airlock, and you have an oxygen free zone. #6.5 Dimensions:
1 1/8” Bottom Diameter; 1 3/8” Top Diameter
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