These airlocks are removable, which makes them easier to clean. Small and lightweight, easy to store and save space, very durable, easy to use and safe. The airlock nozzle is made of silicone, which is durable and soft, and is a good auxiliary tool for food fermentation. Create a closed system that allows carbon dioxide to escape and prevents oxygen and harmful bacteria from entering. It is very suitable for preserving food, fermenting cabbage, kimchi and sauerkraut, as well as brewing, beer, sake, etc. Specifications: Material: PP plastic Air lock: 11.5cm x 3.7cm Features: 1.Can emit carbon dioxide and fermentation gas and keep the air clean. 2.Anti-suction design prevents liquid from dripping. ;to be sucked in. How to use: 1.Drill a suitable hole on the lid of your fermenter. 2.Use the inserted white silicone grommets hole in the lid. 3.Remove the cap,then fill the airlock with half of the water. 4.Replace the cap and insert the tapered end of the airlock in the grommet hole to seal the bottle. 5.Gases are released during the fermentation process. You will see bubbles forming and escaping from the through airlock water. Note: 1.Please wash the fermentation lids before use, and they can be washed in the dishwasher or cold water. 2.Do not clean the airlock with boiling water. Package included: 10 * Airlock Fermentation Note: the data are all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.