Dynaswivel NPT Air Line Connectors, 1/4 in (NPT) F, CompositeNever fight an air hose againFor use with most air tools, grinders, sanders, glue guns, drills, buffers, etcThe Dynaswivel is a patented "universal-joint" that connects portable air tools to an air lineImproves tool maneuverability and air flow, minimizes operator fatigue and