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 for sealing Air passes through freely and work without a for core Compatible for w / valves 1 / 4 " female NPT, compatible for w / most tire inflator, wheel pressure gauge and compressor Straight chuck tip is suitable for all vehicles Upgraded heavy duty brass air chuck make it easier locking onto valves no air leakage ever since you have questions, please us, Manufacturer: Kaeltsyn