The air chuck is a standard brass ball foot chuck that attaches to air lines for general air filling applications. It is a direct air line, or closed chuck type, which means that it comes equipped with a built-in shutoff valve and is not suitable for use with inflator or pressure gauges. It has a maximum pressure rating of 150 pounds per square inch (psi), and a 1/4" female National Pipe Thread Taper (NPT) connection. This air chuck is suitable for a wide range of general commercial and industrial air filling applications.