Straight Foot, Dual Head, Air Chuck, 1/4" Female National Pipe Thread, Designed & Manufactured To Exacting Standards, Maximum Air Pressure Of 150 LB/IN, For Inner Duals Allows Easy Access To Inner Dual When Valve Is Facing Inward, Both Ends Lock On To Valve Core Thread, Sealing Type Chuck Is Closed & Is For Use On An Airline Or With An Inflator Gauge.