LEGO Red Technic Pneumatic Cylinder Old 48mm with Black Piston (4 Studs Long) | Brick Owl - LEGO Marketplace
LEGO MOC Piston Mechanism 3 by 2in1 | Rebrickable - Build with LEGO
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