Air chuck for tire inflation with efficient brass construction1、Air Tight Chuck: This locking air chuck boasts 3 built in chucks, enabling fast and easy locking on the tire valve stem with a simple push. Pulling it back releases the grip, ensuring no air leakage. 2、Easy to Use: The chuck's locking mechanism grips the tire valve stem automatically. All you need to do is view the tire pressure gauge and inflate to the desired pressure with the inflator. Made of solid brass nuts and metal alloys to ensure long durability. 3、Closed Flow Chuck: The locking chuck enables the stop valve to turn off airflow when the stem is not open, and the air only flows when you slide the chuck sleeve down and bite the stem. 4、Wide Application: The tire air chuck is 1/4 inch FNPT, making it suitable for most tire gauges and inflators to control air flow during the inflation. Don't use exceed the maximum pressure 150PSI. 5、Suitable for US Valve: Standard bore size fit for US Valve (0.305in OD), fits for most tire gauge inflators in the market. Standard bore is available for Cars, Offroad, Trucks and so on.