1Double Head: Equipped with two zinc alloy head push pull collets, straight head designed for inner or unitary wheels or hard to reach valves, outer wheel 30 reverse collet. 2Leakproof: This double ended wheel pneumatic chuck is a closed tire chuck designed for slow inflation with an internal shut off valve. Air only passes through the pneumatic chuck when it engages the tire valve. 3Easy to Operate: The tire inflatable rod is designed with a push in collet, no need to screw the collet onto the valve stem, just push the collet onto the valve to achieve a good seal. 4Compatibility: The end of the tire clevis features a 1/4in F?Npt (female) threaded fitting, making it compatible with most air compressor hoses and fittings. 52 in 1 Design: 2 in 1 multifunctional pneumatic chuck with check pressure and inflation function for trucks, trailers and motorhomes.