Pack contains 2 bored rubber bungs and 2 S-shaped bubbler airlocks with red caps. Bungs fit standard 1 gallon glass demijohns: height 32mm, top diameter 30mm, base diameter 27mm. Not suitable for plastic demijohns. The airlock lets CO2 escape during fermentation while keeping air, dust and insects out. The red caps keep dust out. Easy to use: half-fill the airlock with water or sanitiser solution, push it into the bung, then press the bung into the demijohn neck. Re-usable. Sanitise before each use. The airlocks also fit standard fermenter lid grommets.
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