For most of my adult life, I've blown tires with an Allen wrench to depress the valve. Who knows how many hours I've wasted sitting by the wheel, sniffing the stale air from the tires, hearing the terribly slow hiss while being swarmed by brakes, mosquitoes, curious tourists and other evil spirits. Those hours are gone forever. But now everything has changed! Using this awesome ARB tool, I took 4 Suburban tires from 42 PSI to 19 PSI in less time than my 3 year old found and drank a bag of sugary drink from the fridge. I had to wiggle a bit to get the valve core all the way out, but once it was out the *hiss* of air from the tire escaping through the tool was lovely. I imagine it would be easy to over-deflate a tire with this tool, so crouch behind the wheel to take a look! relax time!