Young's Super Major Airlock has an extra-large water chamber — ideal for set-and-forget fermentations where you don’t want to worry about the water level drying out. Chamber-style fermentation trap that allows CO2 to escape while keeping bacteria and oxygen out of your fermenting beer or wine.
Fits standard grommet holes in fermentation vessel lids and bored bungs for demijohns. Use with Fermentation Vessels. Also available: Handy Airlock (2's) and Bubbler Airlock with Red Cap.