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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
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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 : Industrial & Scientific
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Lego 4 New Yellow Pneumatic Cylinder V2 2 x 11 Technic Pieces | eBay
LEGO part 47224c01 - Yellow Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) at BrickScout