Inflate, Deflate, and Equalize air pressure in all four tires simultaneously. You can also check all tires’ PSI from the manifold, so no more continuously bending over to fit PSIs. The device also allows you to run different PSIs in the front tires from the back tires and even move air from a spare tire into other tires. This version fits up to a 125” wheelbase with the air source in the middle of the front or rear bumper areas or in the center of the side of the vehicle.