Badger Air-Brush Company Plunger and O-Ring for Model 100, 105, 150, 155, 175, 200, 200NH, 360 and 3155 Use with Badger Air-Brush Co airbrushes Located inside the Valve Casing Controls airflow through the airbrush Held in place by the valve screw Badger Air-Brush parts are proudly made in America