The bubbler-type airlock (fermentation trap) fits into a bored rubber or cork bung in the lid of your fermentation vessel. Half-fill with water and when fitted, it protects your ferment by allowing CO2 — produced during fermentation — to pass out visually as bubbles, while preventing oxygen and bacteria from entering the vessel.
Watching the bubbles is also a satisfying visual confirmation that your yeast is actively fermenting! Fits standard 25 Litre Fermentation Vessels.
Essential starter kit item. Complete your setup with a Hydrometer, Steriliser, and Simple Syphon.