Solid food grade pure tan gum stopper. Can be easily drilled to fit airlock, thermometer, etc. Made of chemical tolerant pure tan gumAlthough often referred to as a "rubber bung" or "rubber stopper," our bungs are actually made from food grade pure tan gum instead of rubber. We use this particular material because it is highly chemical tolerant, specifically to ethanol, whereas rubber is not. Bottom- 2 7/16", Top- 2 31/32" Fits our High Capacity column
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