Description: It is this airlock features that can be in a very good isolation of air during the secondary fermentation, emit carbon dioxide,for honey, milk fermentation and can prevent oxidation with the help of the use of rubber stopper with holes or silicone plug. It is this airlock features that is easy to operate and all you need is to 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. It is made of plastic, which is durable. The length of the product is 17cm, the width is 5cm. It can be used for pure juice fermentation, such as white grapes, honey fermentation,etc. Item Name: Airlock Material:Plastic Size Details: Airlock Size: 17cm x 5 cm/6.69" x 1.97" (Approx.) Outlet Diameter: 1cm/0.39" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Airlock 1 X Lid