It can release carbon dioxide and be used in the fermentation of honey, white wine, and dairy alcohol, and can prevent oxidation.[Good tightness]The good airtightness of the fermentation airlock facilitates fermentation, effectively isolates the 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 push 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 many and many. The lock can be used for various fermentation projects to preserve food, beer, wine, sauerkraut, kimchi, cider, fruit wine, rice wine, broccoli, carrots and ginger and kimchi. brew. Occasions (Kimchi, Kombucha, Brewing Wine).Suitable for pure fermentation, such as white grape, mead fermentation, red wine secondary fermentation, etc.color:TransparentandredandblackMaterial:PPsize:17cmPackage Contents:6 x Airlocks12 x sealing ringsOnly the above package content, other products are not included.Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 13cm.