These airlocks are removable, making 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, 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 food preservation, fermentation of cabbage, kimchi, and sauerkraut, as well as brewing, beer, sake, etc. Specifications: Material: PP Plastic Airlock: 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 being sucked in. How to use: 1.Drill a suitable hole on your fermenter lid. 2.Use the white silicone grommets inserted into the 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 into the grommet hole to seal the bottle. 5.Gas is released during the fermentation process. You will see bubbles forming and escaping through the water in the airlock. 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: 4 * Airlock Fermentation