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LEGO PART 19475 Pneumatic Cylinder 1 x 5 with 2 Stepped Inlets [V2] | Rebrickable - Build with LEGO
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Pneumatic Cylinder with 2 Inlets and Rounded End Medium (48mm) : Part 47224c01 | BrickLink
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Pneumatic Cylinder with 2 Inlets Small (32mm) : Part x189c01 | BrickLink
Technical Parts DIY Pneumatic Kit With Air Pump Push Rod Switch Piston Air Pipe Pneumatic Pump MOC Blocks Bricks 47225 19476 - AliExpress
Exploring Piston Engine Design With LEGO | Hackaday