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# 6 Bung - Rubber Stopper - Solid

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.

#6 Solid Dimensions: 1 1/16” Bottom Diameter; 1 1/8” Top Diameter