Amflo 126 Straight-On Air Line Chuck with Shut-Off - 1/4" Female NPT Small diameter tip allows this straight-on air line chuck to reach into tight spaces that standard chucks can't get to 150 PSI maximum air line pressure Cast and machined brass construction, with black anodized tip, is built to withstand the toughest home garage or shop use Not for use with inflator gauges; chuck has it's own shut-off valve and will not work with inflator gauges which are intended to regulate the air flow 1/4-18 female NPT inlet threads