Technic Pneumatic "mini pump?" - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
A beautifully-designed LEGO pneumatic compressor | Arduino Blog
LEGO 26288c01 Pneumatic Pump Large (11L) with 1 x 3 Liftarm - FREE P&P! | eBay
Lego Vacuum Pump - YouTube
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 Pipe
technic - Which sets currently contain pneumatic LEGO equipment? - Bricks