I bought a used car. The previous owners adjusted the valve stems very short when they last fitted the tires. I know short ones are cheaper. With the hubcaps in place, I found it impossible to add air to the tires. I first bought 3/4" valve extensions and things have improved a lot. An extra half inch from them makes a world of difference. Air pump/compressor jet to the end of that extension, only then does it open the valve core to let air in (or omit them if you wish).I leave them installed all the time as they are barely noticeable.If you are afraid of theft you can just leave one in the car and screw it onto the valve stem of any tire before removing the tire vent, then simply unscrew the extension again for safe storage.