Dynabrade Dynaswivel NPT Air Line Connectors Never fight an air hose again. For use with most air tools, grinders, sanders, glue guns, drills, buffers, etc. The Dynaswivel is a patented "universal-joint" that connects portable air tools to an air line. Improves tool maneuverability and air flow, minimizes operator fatigue and extends hose life. Pack of 1