These long flexible tire air valve extenders successfully solved a series of operations such as inability to pump or check air pressure due to insufficient space between the valve and the spokes, or the inconvenient position and angle of the valve. You can placed them on your spare tire under the truck and you can check the tire pressure without dropping the tire from its stored position.The threaded head on the valve extenders is screwed on the existing valve stem, and the included end cap replaces the existing valve stem cover. However, when you're removing the tire valve extension, more air escapes that you would like. No problem...just remember to over-inflate by a pound or two so when you remove, you can adjust a bit with your checker.These tire valve extensions are rubber hoses, flexible and durable, and strong plasticity. With rim clamps, you can work more efficiently, check the pressure and fill the air.Dually tire valve stem extenders compatible for Harleys, RV, passenger cars, stroller, bicycles, motorcycles, trailers and portable air compressor.You will get 2pcs 8.25 Inch valve stem flexible extension.