Plews 17-726 Grip-Tite Chuck Grip Tight' lock-on air chuck Works like a quick coupler; snaps on any tire valve and stays put until released - no need to keep pressure on chuck to keep airflow going For use with inflator gauges; chuck does not have it's own shut-off valve and will not work without an inflator gauge which is intended to regulate the air flow All metal construction - built to withstand the toughest home garage or shop use 1/4-18 NPT Female inlet thread