It releases carbon dioxide and is used in the fermentation of honey, white wine, and dairy alcohol, helping to prevent oxidation. The operation is simple: pour water into the exhaust valve, insert it into the lid of the brewing barrel or the rubber stopper on the top of the fermentation container, and close the lid. Effectively prevents insects from entering the wine or beer. All fermentation processes are automatic, require no manual control, and the product can be reused for a long time. Suitable for pure juice fermentation, such as white grape, mead, and red wine secondary fermentation. Subtype: Airlock Color: Transparent + Red + Black Material: PP Size: Approximately 170x10mm Package Contents: 10 x Check Valves 10 x Lids 10 x Sealing Rings Only the above package content is included; other products are not included. Note: Lighting and different displays may cause the color of the item in the picture to differ slightly from the actual item. Measurement allows an error of +/- 1-3 cm.