Handy Airlock for wine and beer making, helps keep a air tight seal on your fermenting vessels. Bubbles away quietly Standard 1 Gallon sized, reusable bored rubber bungs suitable for use with glass demijohns. Not suitable for plastic demijohns. Designed to accommodate an airlock. Bung Dimensions Size: Height 32mm / Diameter (top) 30mm / Diameter (base) 27mm
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