Parker 4mm x 8mm Plug-in Reducer - LE-3666 04 08
4mm Outside Diameter x 8mm Stem Outside Diameter, LF3600 Metric Push-in Tube Fitting, Reducing Stem x Tube, Straight Stem Connector, Nickel Plated Brass, Working Temperature -20C to +120C, Maximum Working Pressure 20 bar, Parker Legris