Food-grade silicone is always beet than rubber as it does not leave any taint on the wine or spirit.
These bungs are designed to fit Bottle 5L glass with handle" / 5L demijohn and 23L glass carboy and the 11L Glass Carboy. It is a tapered bung and the size is a diameter of 25mm at the base and 38mm at the top . This silicone bung comes complete with a hole to fit a standard sized airlock.
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