It can release carbon dioxide and be used in the fermentation of , white wine, and dairy alcohol, and can prevent oxidation. [Good air tightness]The good airtightness of the fermentation airlock facilitates fermentation, effectively isolates the air and prevents oxidation. Automatic exhaust at room temperature without manual control [Easy to put on and ] - This type of dust cap has a design on the surface and will not slip when opened. There are 3 buckles inside, press it gently downwards, you can it with a button, pull it up and twist to open it. The lid does not need to be drilled as there is a crevice which allows the gas to escape. [Reusable and Versatile]These airlocks are solid and reusable. They can last for a long time. Simply place in your disinfectant and use many and many. The air lock can be used for fermentation projects to preserve food, beer, wine, sauerkraut, , cider, fruit wine, rice wine, broccoli, carrots and ginger and . brew. Occasions (, Kombucha, Wine). Suitable for pure fermentation, such as white grape, mead fermentation, red wine secondary fermentation, etc. color:Transparent+red+black 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 and 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.