Pneumatic AIR TANK KIT 2 with cylinder,pump,switch(Hose is compatible with Lego) | eBay
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
Pneumatic Tube (Hose) : Original Box 5102-1 | BrickLink