Description:1. This item can emit carbon dioxide to ferment alcohol in honey, white wine and milk, and can also prevent oxidation.2. It is easy to operate. Simply fill the exhalation valve with water, insert it into the lid of the brewing keg or the rubber cap on the top of the fermentation container, and then cover it with the lid.3. It can effectively prevent wine/beer flies from flying with a lid.4. The whole fermentation process is automatic fermentation without manual control. And it can be used repeatedly for a long time.5. It is suitable for pure juice fermentation, such as white grape fermentation, honey wine fermentation, red wine secondary fermentation. Specifications:Material: PlasticColor: Transparent as shown in the pictureSubtype: AirlocksProduct Length: Approx. 17cm/6.7inchProduct Max Width: Approx. 1cm/0.4inchProduct Weight: Approx. 12gNotes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Included:1*Valve