Designed and manufactured to exacting standards. Closed/Sealing-type air chuck for use on a compressed airline. Dual head chuck makes tire valves more accessible with the two heads for easier access. Inflate by hooking the closed head (w/valve) directly to an airline. Easy access to inner dual when valve is facing inward. Great for reaching into Dually trucks and other challenging angles. Maximum 150 psi (pounds per square inch). Dual head 1/4 In. Female NPT (National Pipe Taper).