It releases carbon dioxide and is used in the fermentation of honey, white wine, and dairy alcohol while 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 top of the fermentation container, and close the lid securely. Effectively prevents insects from entering the wine or beer with a sealed lid. Supports automatic fermentation processes without manual intervention and is reusable for extended use. Suitable for pure juice fermentation, including white grape, mead, and secondary fermentation of red wine. Subtype: Airlock Color: Transparent + Red + Black Material: PP Size: Approximately 170x10mm Package Contents: 10 x Check Valves 10 x Lids 10 x Sealing Rings The package includes only the items listed above; other products are not included. Note: Lighting and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3cm.