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MOC Technical Parts 1 meters Pneumatic Tube Internal DIA 2mm External DIA 4mm Compatible with Lego for Kids Boys Toy 5102 21670 _ - AliExpress Mobile
LEGO 5102 Technic Pneumatic Tube Black and Grey 60 and 100 cm | BrickEconomy
Pneumatic KIT 2 with cylinders,pump,switch,etc (Hose is compatible with Lego) | eBay
Quickun Pneumatic Tubing 8mm x 5mm PU Polyurethane Tube Air Hose Line for Air Compressor Fitting or Fluid Transfer (Blue 32.8ft/10Meters) - - Amazon.com
Pneumatic Tube (Hose) : Original Box 5102-1 | BrickLink
Pneumatic Hose WHITE (1 meter) | BRICKshop - LEGO en DUPLO specialist
Quickun Pneumatic Tubing 6mm x 4mm PU Polyurethane Tube Air Hose Line for Air Compressor Fitting or Fluid Transfer (Clear 32.8ft/10Meters) - - Amazon.com