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
LEGO 5102 Technic Pneumatic Tube Black and Grey 60 and 100 cm | BrickEconomy
Bricker - Part LEGO - 5102c200 Hose, Pneumatic 4mm D. 200L / 160.0cm
LEGO part 5102c27 - Dark Bluish Gray Hose, Pneumatic 4mm D. 27L / 21.6cm at BrickScout
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
Lego compatible pneumatic tube
Lego® 4697b, 4211508 pneumatic hose, T piece, light bluish gray
Pneumatic Hose BLACK (5 meter) | BRICKshop - LEGO en DUPLO specialist
Moc Parts Pneumatic Hose Air Pump Push Rod Putter Switch Piston Air Tank Pump Compatible With Legoeds Pneumatic Building Blocks - Iot Accessories - AliExpress