Pack of 3 Rubber Bungs With Holes For Airlocks To Fit Glass DemiJohns

These bored rubber bungs have a hole designed to take an airlock and are designed for use with Glass Demi-Johns. They also fit fermentation carboys designed for use with bungs. The size of our bungs are 27mm base diameter x 31mm top diameter, and they are 32mm high. Drilled with an 8mm hole to take an airlock. All measurements approximate. Care should be taken never to stopper a Demi-John that may have pressure build inside the vessel.