LEGO part 26288c01 - Blue Pneumatic Pump Large (11L) with 1 x 3 Liftarm at BrickScout
LEGO® 26288c01 6152004 - 6353193 - ToyPro
Sariel.pl » Compressors
LEGO Pneumatic Pump 2 x 3 x 11 (26288) | Brick Owl - LEGO Marketplace
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File:Lego Pneumatic 26288c01 blue pump (28484758712).jpg - Wikimedia Commons
Amazon.com: 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 : Industrial & Scientific
A beautifully-designed LEGO pneumatic compressor | Arduino Blog