Pneumatic Cylinder Disassembly & Lubrication Findings - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
BrickLink - Part 47224c01 : LEGO Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) [Pneumatic] - BrickLink Reference Catalog
Which sets currently contain pneumatic LEGO equipment? - Bricks
Buy Goshfun 19Pcs 10-Kinds MOC Pneumatic Parts Bricks with Air Pump Push Rod Switch Piston Air Pipe, DIY Small Particle Stem Building Blocks Toy Set Compatible with Lego, Random Color of Air