Feature 1、Creates a closed system that allows carbon dioxide out and prevents oxygen and harmful bacteria from getting in 2、Lets fermentation gas out and to keeps air from reaching the beer or wine 3、Very durable and easy to clean, safe to use 4、Compact and lightweight size, easy to be stored and saves space 5、Perfect for secondary fermentation, preventing back-flush into the fermentation chamber during ambient temperature changes in the room Description: This item creates a closed system that allows carbon dioxide out and prevents oxygen and harmful bacteria from getting in and it lets fermentation gas out and to keeps air from reaching the beer or wine. Compact and lightweight size is easy for it to be stored and saves space. Perfect for secondary fermentation, preventing back-flush into the fermentation chamber during ambient temperature changes in the room. Features: Creates a closed system that allows carbon dioxide out and prevents oxygen and harmful bacteria from getting in. Lets fermentation gas out and to keeps air from reaching the beer or wine. Very durable and easy to clean, safe to use. Compact and lightweight size, easy to be stored and saves space. Perfect for secondary fermentation, preventing back-flush into the fermentation chamber during ambient temperature changes in the room. Specification: Condition: Material: PP Color: As picture shows Product Height: Approx. 15cm / 5.9inch Product Weight: Approx. 20g Package Included: 1 x Airlock