"Filling Adapter Daystate Air Rifles & Paintball QF Filling Adapter"Daystate - HP Quick Release Connector or Filling Adapter ( Female Snap Connector - Filling Valve ) for Paintball Guns and Paintball air cylinders ,Snaps on to the side valve of a paintball cylinder. Not normally supplied with the gun. ,Female 1/8BSP thread. Comes complete with 1/8BSP to 1/8BSP male adapter as shown to fit to your filling hose. "