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Lego compatible pneumatic tube
LEGO Black 4mm Diameter Pneumatic Hose 24 cm | Brick Owl - LEGO Marketplace
Quickun Pneumatic Tubing 6mm x 4mm PU Polyurethane Tube Air Hose Line for Air Compressor Fitting or Fluid Transfer (Black 32.8ft/10Meters) - Amazon.com
Moc Technical Parts 1 Meters Technical Pneumatic Tube Internal Dia 2mm External Dia 4mm Compatible With Lego For Kids Boys Toy - Blocks - AliExpress
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
Quickun Pneumatic Tubing 8mm x 5mm PU Polyurethane Tube Air Hose Line for Air Compressor Fitting or Fluid Transfer (Orange 32.8ft/10Meters) - Amazon.com
Hose, Pneumatic 4mm D. 54L / 43.2cm : Part 5102c54 | BrickLink
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