Modified Pneumatic Cylinder - Medium Stud End - Old Style – Green Gecko Workshop
LEGO Technic 4 pcs NEW YELLOW MINI PNEUMATIC PISTON CYLINDERS Air pressure Pump pack lot set
Pro Instructions - 1 Cylinder Switchless Lego Pneumatic Engine 2500 RP – Green Gecko Workshop
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
LEGO part 47224c01 - Yellow Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) at BrickScout