Homebrewing Winemaking Kits descriptions We use high-quality raw materials, all materials are very suitable for the product, please rest assured to buy. One Way Exhaust Water Seal Wine Fermentation Air Lock - Plastic Bubble Grommet. Features: After Sterilized Adding Water to the Exhaust Valve. After Both Sides of the Exhaust Valve's Water in the Parallel State, Gently Insert the Brewing Bucket Lid. When the Wine Was Ferment Generated Bubbles, Through the Exhaust Valve Discharged to Buckets Outside, All the Fermentation Process is in Normal Temperature, Automatic Fermentation, Exhaust, Without Manual Control. Can Be Used for Home-brewed Beer, Wine, Cider and Other Uses. Specification Material: Plastic Color: Transparent S-Shape Air Lock Twin Bubble Grommet Homebrew Beer Fermentation Wine Making Application: Pure Juice Fermentation, Such As White Wine Fermentation, Red Wine Secondary Fermentation, Preventing Back-flush into the Fermentation Chamber During Ambient Temperature Changes in the Room. This Style Airlock is Typically Used on Fermenters Up to 20 Gallon. Delivery Quantity: 3pcs Product color: silver Product size: 76*19mm