["Features:\nThe fermentation airlock is made of high quality BPA-free polypropylene \nand the stopper is made of food grade rubber, \nwhich is a good and helper for the fermentation food.\nBrewing airlock can be used for preserving, wine making, beer brewing, \nfermenting sauerkraut, kimchi that can satisfy your daily fermentation need.\nSimple to press the stopper onto the carboy, insert the beer airlock to the stopper, \npour some water into airlock and cover the lid to complete all operations.\nBrewing airlock makes easier for the fermentation caused it could effectively isolate the air\nto prevent oxidation and allow the whole fermentation process to be automatic fermentation\nand exhaust at normal temperature without manual control.\n\nSpecification:\nMaterial: Plastic\nColor: Transparent as picture\nSub-Type: Airlocks\nSize:\nLength 170mm/7\"\nTube Diameter:10mm/0.4\"\nQuantity: 5 Pcs.\n\nNote:\n1.Transition: 1cm=10mm=0.39inch\n2.Please allow 0-3cm error due to manual measurement. pls make sure you do not mind before you bid.\n3.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\n\nPackage includes\n5Pcs Fermenting Air Locks."]