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 various 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.