Check tire pressure and add air anytime you need with the DeWalt Sight Glass Inflator. This convenient unit combines an inflation gun, air chuck and sight glass and is easy to use. The easy to read sight glass accurately shows the amount of air in the tire from 10-160 psi. If a tire has been over-inflated, the built-in relief valve makes deflating easy. Includes a 10" flexible hose to make reaching tire stems easier.