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LEGO Pneumatic switch with pin in new dark grey with additional clikits flower: Amazon.de: DIY & Tools
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LEGO PART 19474 Pneumatic Switch with Pin Holes, Axle Hole and Stepped Outlets | Rebrickable - Build with LEGO
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LEGO® Technic Pneumatic Switch with step positions DK. ST. GRAY (DARK STONE GRAY) - (6131617/4694cc01)
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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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