The 3-piece airlock is the best choice for the primary fermenter, since it comes apart for easy cleaning in the event of a blow-off. Fill to the line with boiled water or sanitizer to create a closed fermentation system that allows co2 to escape, but does not allow air back in to contaminate your beer or wine.

A fermentation lock or airlock is a device used in beer brewing and winemaking that allows carbon dioxide released during fermentation to escape the fermenter, while not allowing air to enter the fermenter, thus avoiding oxidation. For additional information regarding the product, please contact with DuBuy support team.