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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, simply insert this stopper into the mouth of your carboy and you have an oxygen free zone.
#7.5 Solid Dimensions: 1 1/2” Bottom Diameter; 1 1/4” Top Diameter
#7.5 Solid Dimensions: 1 1/2” Bottom Diameter; 1 1/4” Top Diameter