It was a piece of junk! I tried checking my van's tires and inflating them to 44psi, the pump would not go above 42psi. Also, it took a few minutes to get to that level from 35psi to 42. By the time I got to the 3rd tire the black hose leading from the supercharger was very hot and by the time I got to the 4th tire. she smoked!