Handy Airlock (pack of 2) — a compact chamber-style fermentation trap that fits a bored rubber or cork bung in the neck of a demijohn or fermentation vessel lid. Half-fill with water and when fitted, it allows CO2 to escape while keeping oxygen and bacteria out of your ferment.
Fits standard bored bungs and fermentation vessel lids. Use with Cork Bungs for demijohns, or standard grommet lids on Fermentation Vessels. Also available: Super Major Airlock for a larger water chamber.