LEGO 5102 Technic Pneumatic Tube Black and Grey 60 and 100 cm | BrickEconomy
LEGO Technic Pneumatics - hose connector with axle connection
Amazon.com: Build 19 Piece Pneumatic Kits with Technik Parts Contains Air Pump, Piston Pressure Rod, Cylinder,Pneumatic Hose &More,Great for DIY, MOC Tech, Compatible with Lego : Industrial & Scientific
Lego compatible pneumatic tube
LEGO Pneumatic 15 x Hose Connector w/Axle Hole - Blue - - 99021 for sale online | eBay