Although I recently purchased an EPAuto 12V DC Portable Air Compressor Pump, 100PSI Digital Tire Inflator to carry around in my car, I prefer to use a stationary compressor to inflate car tires at home. However, using an air liner and gauge interchangeably can be tedious, and my old air liner wouldn't fit through the hole in my new Prius' hubcaps. This tire inflator is the perfect solution and even comes with a fitting to connect to my existing air hose. ) by sealing with the supplied Teflon tape. I also used teflon tape on the inflator cartridge threads - a very large amount of tape is included in the kit. It comes with a few other accessories I haven't used yet: a screw-on chuck, a valve spool remover/installer, and two extra valve cores. It also comes with four extra valve caps - and I used one of those already after losing the cap. The cartridge is simply snapped directly onto the valve stem with almost no air loss and the pressure is displayed on the manometer. Simply push the lever on the pressure gauge until the pressure is correct. If you overdo it a little, use the pressure release button on the back of the gauge stem to release some air. When the pressure is correct, release the valve stem and quickly remove it. With practice, it will be possible to limit the air loss in car tires to no more than a tenth of a pound or two, but it becomes more difficult with bicycle tires due to the higher pressure and lower volume. The plastic surface of the pressure gauge had no protective coating and was slightly scratched.