It can release carbon dioxide be used in the fermentation of , white wine, dairy alcohol, can prevent oxidation. [Good air tightness]The good airtightness of the fermentation airlock facilitates fermentation, effectively isolates the air prevents oxidation. Automatic exhaust at room temperature without manual control [Easy to put on ] - This type of dust cap has a design on the surface will not slip when opened. There are 3 buckles inside, press it gently downwards, you can it with a button, pull it up twist to open it. The lid does not need to be drilled as there is a crevice which allows the gas to escape. [Reusable Versatile]These airlocks are solid reusable. They can last for a long time. Simply place in your disinfectant use many many. The air lock can be used for fermentation projects to preserve food, beer, wine, sauerkraut, , cider, fruit wine, rice wine, broccoli, carrots ginger . brew. Occasions (, Kombucha, Wine). Suitable for pure fermentation, such as white grape, mead fermentation, red wine secondary fermentation, etc. color:Transparentandredandblack Material:PP size:17cm Package Contents: 6 x Airlocks 12 x sealing rings Only the above package content, other are not included. Note: Light reflection different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.