Solid food grade pure tan gum stopper. Can be easily drilled to fit airlock, thermometer, etc.
Made of chemical tolerant pure tan gum
Although often referred to as a "rubber bung" or "rubber stopper," our bungs are made from food grade pure tan gum, NOT rubber. This is used specifically because it is highly chemical tolerant, specifically to ethanol whereas rubber is not.
Bottom- 1 3/4", Top- 2 5/64"
Fits our Pro Series II and Pot Distiller columns