This 3 piece airlock creates a closed and healthy system allowing gas to escape. Be a successful fermenter and keep particles out that contaminate veggies, wine, kombucha, mead or beer. Simply remove the cap and fill to the line with water, sanitizer solution or alcohol. Place the 3 piece airlock into a rubber bung, an airlock grommet, or a 64 ounce jug screw cap. Easy to clean and made with durable plastic. Clean with soap and warm water. Can also be cleaned with an air airlock brush. Use with fermentation buckets, jars and other glass fermenters.