This adapter saved the day when paired with a Goodyear air pump. You can pump air into bike and car tires with it so easily, even a caveman can handle it! Just screw it to the end of the air hose and you have the easiest way to connect to your tire nipples. The open/closed valve makes it easy to pump air into your tires and prevents leakage when the air hose is removed. You won't regret buying it, it works great and doesn't leak air!