Gaslow Brass quick release gas coupling 01-1970 for 8 mm/5/16″ bore hose (10 mm o.d. x 10 mm o.d.). By sliding back the knurled collar, one hose nozzle is released. The coupling is designed for barbecue and patio heater assemblies. The body of the coupling has a stop valve fitted internally with direction of flow towards loose nozzle.