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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
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Technic Pneumatic "mini pump?" - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
![BrickLink - Set 970117-1 : LEGO Pneumatic Hand Pump (Pack of 2) [Educational & Dacta:Service Packs:Technic] - BrickLink Reference Catalog BrickLink - Set 970117-1 : LEGO Pneumatic Hand Pump (Pack of 2) [Educational & Dacta:Service Packs:Technic] - BrickLink Reference Catalog](https://img.bricklink.com/ItemImage/SL/970117-1.png)