New head design provides easier angle adjustment and keeps head oriented in its adjusted position during use Unique design provides added hand clearance between filler and hot brake rotors 1/4 inch (EU: 0,64 cm) NPT female inlet allows use of common air hose couplings and fittings Pivoting angled head design allows access to difficult to reach tire valves O-ring sealing system and thrust washer provides reliable airtight seal. TOOL PRO FILL AIR CHUCK