Technic Pneumatic "mini pump?" - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
LEGO® bb0875 6152131 - ToyPro
LEGO Transparent Light Blue Pneumatic Pump with Black Finger Knob (63856 / 74720) | Brick Owl - LEGO Marketplace
Amazon.com: Build 19 Piece Pneumatic Kits with Technic Parts Contains Air Pump, Piston Pressure Rod, Air Lines, Pneumatic Parts Perfect for DIY, MOC Tech, Compatible with Lego (19) : Industrial & Scientific
LEGO® 19482c01 6133813 - 6156732 - ToyPro
Pneumatic Pump Small (5.5L) : Part x191c01 | BrickLink
LEGO part 26288c01 - Blue Pneumatic Pump Large (11L) with 1 x 3 Liftarm at BrickScout