technic - Which sets currently contain pneumatic LEGO equipment? - Bricks
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Sariel.pl » Compressors
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High Tech Parts Blue Pneumatic Pump Small (6L) V2 with Reinforced Cylinder 19475 2793C01 1x5/2x6 Compatible with MOC 8800 Blocks|Blocks| - AliExpress
Build 35 Piece Pneumatic Kits with Technik Parts Contains Air Pump, Piston Pressure Rod, Air Lines, Pneumatic Parts Perfect for DIY, MOC Tech, Compatible with Lego