Allows for the convenient switch of airbrushes to your air source. Plug attaches to Grex, Olympus, Iwata and Harder Steenbeck airbrush and connects to all standard quick connect couplers. Coupler: Universal coupler that accepts all quick connect plugs. Will attach to plastic airbrush hoses. Fine precision machined brass for consistent durable use. Smooth electro plated surface for great finish and ease of maintenance.