Pneumatic Cylinder V2 1 x 11 : Part 21828c01 | BrickLink
LEGO part 2793c01 - Trans-Clear Pneumatic Cylinder with 2 Inlets Medium (48mm) with Black Top at BrickScout
Pneumatic Cylinder with 2 Inlets Small (32mm) : Part x189c01 | BrickLink
Pneumatic Cylinder V2 1 x 5 : Part 19475c01 | BrickLink
Technic Pneumatic "mini pump?" - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
technic - How to open first version of the pneumatic cylinder? (Part no 4688c01) - Bricks
Goshfun 32Pcs 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 Pipe
LEGO part 47224c01 - Yellow Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) at BrickScout