High Tech Parts Blue Pneumatic Pump Small (6L) V2 with Reinforced Cylinder 19475 2793C01 1x5/2x6 Compatible with MOC 8800 Blocks|Blocks| - AliExpress
LEGO 26288c01 Pneumatic Pump Large (11L) with 1 x 3 Liftarm - FREE P&P! | eBay
Technic Pneumatic "mini pump?" - 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
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
LEGO® Technic review: 42144 Material Handler | New Elementary: LEGO® parts, sets and techniques