Check the listing for details. S-Shape Air Lock Grommet Homebrew Beer Fermentation Wine Making.. Condition: New. Listed at 6.58 USD. S-Shape Air Lock Grommet Homebrew Beer Fermentation Wine Making. Description: S-Shape Air Lock Twin Bubble Grommet Homebrew Beer Fermentation Wine Making Material: plastic Color: White Usage: After sterilized adding water to the exhaust valve 1/3. After both sides of the exhaust valve's water in the parallel state- gently insert the brewing bucket lid. When 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. Principle: Use single seal valves principle- this principle can be effectively cut off the outside air oxidation of the fermentation medium. All the fermentation process is in normal temperature automatic fermentation - exhaust. Without manual control- simple and easy to use- operation- and also can long-term repeated use. Package included: 1x Wine seal valves