It can release carbon dioxide and be used in the fermentation of honey, white wine, and dairy alcohol, and can prevent oxidation._x000D_ [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_x000D_ [Easy to put on and take off] - This type of dust cap has a zigzag design on the surface and will not slip when opened. There are 3 buckles inside, press it gently downwards, you can close 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._x000D_ [Reusable and Versatile]These airlocks are solid and reusable. They can last for a long time. Simply place them in your disinfectant and use them many times and many. The air 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)._x000D_ Suitable for pure juice fermentation, such as white grape, mead fermentation, red wine secondary fermentation, etc._x000D_ _x000D_ color:Transparent+red+black_x000D_ Material:PP_x000D_ size:17cm_x000D_ _x000D_ Package Contents:_x000D_ 6 x Airlocks_x000D_ 12 x sealing rings_x000D_ _x000D_ Only the above package content, other products are not included._x000D_ Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_