Pneumatic Cylinder with 2 Inlets Small (32mm) : Part x189c01 | BrickLink
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Everything You Want To Know About LEGO Pneumatics - BrickNerd - All things LEGO and the LEGO fan community
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Building a LEGO Pneumatic Engine with Variable Valve Timing - YouTube
Everything You Want To Know About LEGO Pneumatics - BrickNerd - All things LEGO and the LEGO fan community
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Early Simple Machines Building Instruction | LEGO® Education