Airlock bubbler model with black cap
The most popular airlock. Protects against flies, oxidation and contamination. Suitable for containers in the range of 1-50 l. Fits a 9 mm hole.
1.49 € (1.22 € tax excluded)
What does an airlock do?
Filling the airlock with a little water makes it act as a siphon; the water closes the beer or wine off from the outside air; hence preventing outside bacteria from entering. However it allows the carbon dioxide formed during fermentation to escape through the airlock because of the excess pressure.