Cork and air lock suitable for 19lt carboy. mushroom sizes are large diameter 50mm, small diameter 40mm, height 30mm. natural mushrooms suitable for food are used. while the airlock ensures the removal of the carbon dioxide generated during the fermentation, it prevents the entry of air from the outside into the fermenter and thus contamination and oxidation. more than 5 stocks are offered to be sold at the campaign price. Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.