The Fermentation Airlock Is Made Of High Quality Food-Safe Plastic, Reusable And Easy To Clean. This Wine Airlock And Rubber Bung Will Ensure Perfect Results Every Time Keeping Airborn Bacteria Away From Your Wine, Cider, Mead Or Kombucha. It Is An Essential Wine Making Equipment And Mead Making Kit. All Fermentation Processes Are Automatic Fermentation And Exhaust At Room Temperature, Without Manual Control, Easy To Use, Simple To Operate, And Can Be Used Repeatedly For A Long Time. Ust Install The Silicone Stopper/ Silicone Grommets On The Appropriate Cap, Then Insert The Fermentation Airlock, Pour The Water Into The Airlock, And Close The Lid. Suitanle for wine making, sealing, fermentation, grape juice and so on.