Features: For: Pure juice fermentation, such as white grapes, honey wine fermentation, red wine secondary fermentation,etc. Drink: All Homebrew, Beer, Wine, Cider, Spirits All of the fermentation process is automatic fermentation, exhaust, without manual control, easy to use, easy to operate, and can be repeated used for a long Function: With the use of rubber stopper with holes or silicone plug, for red wine fermentation can be in a very good isolation of air during the secondary fermentation, meanwhile it can emit carbon dioxide,for honey, white wine, milk wine alcohol fermentation can prevent oxidation. Package Included: 1 x Check for valve ;1 x Rubber plug Specifications: Style: Sent at random (if you buy more than one product,the color and style may be different or the same) Color:As the picture shows Material:plastic Size: 17.5x5.5cm/6.89x2.17" Quantity: 1Pc Note: 1.Transition: 1cm=10mm=0.39inch 2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid. 3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: (Without retail package) 1Pc x Homebrew Water Seal for Valve with Rubber plug