The (Gas) IN disconnect is for a Cornelius or Firestone Pin Lock Kegs. This Connector has a 1/4" threaded Connection.
In order to connect to a hose you need a 1/4"MFL to 5/16" Barb Swivel Nut (assuming you are using 5/16 red gas hose). This will allow for quick disconnects. The gas connector will also screw directly into a Portable Charger.