Milton HIGHFLOWPRO™ V-Style/European Interchange Pneumatic Coupler and Plug Fitting Kit 1/4-in NPT 6 PC in the Air Compressor Fittings department at Lowes.com
Amazon.com: Utah Pneumatic 6mm Push To Connect Air Fittings Quick Connect Kit Pneumatic Airline Tee Straight Union Air Splitter Push Elbow – Air Ball Valve Air Manifold : Industrial & Scientific