1/4" female NPT, compatible for w/ most tire inflator, wheel pressure gauge and compressor. Straight chuck tip is suitable for all vehicles When use the air chuck to inflate a tire or measure pressure, please use the lock-on clip to secure the chuck to the for stem for sealing Air passes through freely and work without a for core. Compatible for w/ valves If you have questions,please us Upgraded heavy duty brass air chuck make it easier locking onto stem valves no air leakage ever since, Manufacturer: BOYANDM