technic - Which sets currently contain pneumatic LEGO equipment? - Bricks
LEGO Compact Pneumatic Compressor/Valve Unit [WITH INSTRUCTIONS!] - YouTube
Modified LEGO Pneumatic Cylinder - V2 2x11 - Extra Large - 19467c01 – Green Gecko Workshop
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
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A Lego Technic Suction Pump
LEGO Yellow Black Spring 2797c02 Pneumatic Pump - Black Top Technic Construction | eBay