Pneumatic Switch with Top Studs : Part 4694c01 | BrickLink
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LEGO® 4694bc01 4237158 - ToyPro
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LEGO PART 19474 Pneumatic Switch with Pin Holes, Axle Hole and Stepped Outlets | Rebrickable - Build with LEGO
Moc Pneumatic Brick | Pneumatic Switch | Building Block | Bricks Parts | Diy Toys - New - Aliexpress