Pneumatic KIT 2 with cylinders,pump,switch,etc (Hose is compatible with Lego) | eBay
Moc Technical Parts 1 Meters Technical Pneumatic Tube Internal Dia 2mm External Dia 4mm Compatible With Lego For Kids Boys Toy - Blocks - AliExpress
LEGO part 5102c80 - Black Hose, Pneumatic 4mm D. 80L / 64.0cm at BrickScout
Amazon.com: LEGO Technic 4 pcs NEW YELLOW MINI PNEUMATIC PISTON CYLINDERS Air pressure Pump pack lot set switch hose small little robot robotics : Toys & Games
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
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
Bricker - Part LEGO - 5102c200 Hose, Pneumatic 4mm D. 200L / 160.0cm
Moc Parts Pneumatic Hose Air Pump Push Rod Putter Switch Piston Air Tank Pump Compatible With Legoeds Pneumatic Building Blocks - Iot Accessories - AliExpress
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
Hose, Pneumatic 4mm D. 122L / 97.6cm : Part 5102c122 | BrickLink
Moc Technical Parts 1 Meters Technical Pneumatic Tube Internal Dia 2mm External Dia 4mm Compatible With Lego For Kids Boys Toy - Blocks - AliExpress