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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.