1/4 in. OD Polyurethane Pneumatic Tubing - AndyMark, Inc
MaxLine® Semi-Flexible Compressed Air Tubing, 300 Ft. L, Blue - John M. Ellsworth Co. Inc.
Utah Pneumatic 5/16 Or 8mm Air Line Tubing Od 5mm Id Polyethylene Tube Pu Air Hose For Compressed Air Tubing Or Fluid Transfer Pneumatic Hose 8mm Tubing (10 Meter 32.8 Feet) - - Amazon.com
PUN-14x2-BL - Pneumatic tubings (Festo) - Powermatic Online Store
altecweb.com - Pneumatic Tubing
Quickun Pneumatic Tubing 12mm x 8mm PU Polyurethane Tube Air Hose Line for Air Compressor Fitting or Fluid Transfer (Blue 32.8ft/10Meters) - - Amazon.com
5 Meters Pneumatic Tube Air Tubing Component Pneumatic Air Hose 4mm 6mm 8mm 10mm 12mm Pu Pipe Air Line Hose For Compressor - Pneumatic Parts - AliExpress