Pneumatic Pump Small (5.5L) : Part x191c01 | BrickLink
Building A LEGO Pneumatic Engine | Hackaday
File:Lego Pneumatic 26288c01 blue pump (28484758712).jpg - Wikimedia Commons
Air compressor - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
LEGO Pneumatic Pump (Old Style) 48mm with Black Piston (4 Studs Long) and Spring (4701) | Brick Owl - LEGO Marketplace
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 : Toys & Games
Technic Parts for Lego Kits Pneumatic Kit With Air Pump Car Building Blocks Sets | eBay
Pneumatic Pump First Version : Part 4701c01 | BrickLink
Amazon.com: 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
Lego pneumatics - Wikipedia
Air compressor - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Set of 12 Lego Technic pneumatic air pumps shock absorbers | eBay