Product Description: _x000D_ It can emit carbon dioxide for honey, white wine, milk wine alcohol fermentation and can prevent oxidation.Easy operation, simply fill water into the exhaust valve, insert it to the cover of the brew barrel or rubber plug on the top of the fermentation container and then cover it with the lid. _x000D_ Effectively prevents flies flying into the wine/beer with a cover included. _x000D_ All of the fermentation process is automatic fermentation without manual control and can be repeatedly used for a long time. _x000D_ Suitable for pure juice fermentation, such as white grapes, honey wine fermentation, red wine secondary fermentation, etc. _x000D_ _x000D_ Specification: _x000D_ Brand: 100% New High Quality _x000D_ Material: Of High Quality Of Plastic (Ecco Friendlly _x000D_ Color: Transparent as picture _x000D_ Sub-Type: Airlocks _x000D_ Size:length 17cm/6.6" _x000D_ _x000D_ Package includes: _x000D_ 5pcs exhaust valve _x000D_ _x000D_ _x000D_ Note: _x000D_ _x000D_ Transition: 1cm=10mm=0.39inch _x000D_ _x000D_ Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. _x000D_ _x000D_ Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!