This item is designed to transfer air from one tire to another. Lets say you are driving in the middle of nowhere and you get a flat tire. You grab your spare only to find that it is out of air. This hose will allow you to transfer air from all three of your other tires to fill it until you get to a safe area. This will work for auto, bicycle, motorcycle, or any other purpose that uses the same connection. The hose is 10 feet long for easy use.