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Kilner Home Brew Airlock Air Lock & Rubber Bung Stopper Bubbler Set for Demijohn

An airlock and bung is used in conjunction with the demijohn to allow essential gases to escape during fermentation
Insert the Kilner airlock into the bung and then into the top of the demijohn neck
Fill the airlock 1/4 full with tap water; you will notice bubbles starting to appear as gases start to escape