Schrader
Schrader valves (also called American valves) consist of a valve stem into which a poppet valve is threaded with a spring attached. They are used on virtually all automobile tires, and in the United States, on most wider rimmed bicycle tires. In addition to tires, Schrader valves of varying diameters are used in refrigeration and air conditioning systems, plumbing, fuel injection engines, suspension systems, and SCUBA regulators, allowing the user to remove and attach the hose while in use. Another use for Schrader valves is in the fuel injector rail of many automobiles, where it is used as a quick and easy point to check fuel pressure and to connect a cleaner injection device or cleaner cartridge.
Read more about this topic: Valve Stem