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BrickLink - Set 5109-1 : LEGO Pneumatic Tubes and Pieces [Service Packs: Technic] - BrickLink Reference Catalog
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BrickLink - Part 5102c138 : LEGO Hose, Pneumatic 4mm D. 138L / 110.4cm [Hose, Pneumatic 4mm D.] - BrickLink Reference Catalog
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MOC Technical Parts 1meters Technical Pneumatic tube Internal DIA 2mm External DIA 4mm compatible with lego for Kids Boys Toy|Model Building Kits| - AliExpress
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Any known way to bend/shape pneumatic tubes? - LEGO Technic, Model Team and Scale Modeling - Eurobricks Forums
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MOC Technical Parts 1meters Technical Pneumatic tube Internal DIA 2mm External DIA 4mm compatible with lego for Kids Boys Toy|Model Building Kits| - AliExpress
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MOC Technical Parts 1 meters Technical Pneumatic tube Internal DIA 2mm External DIA 4mm compatible with lego for kids boys toy|Blocks| - AliExpress
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MOC Technical Parts 1 meters Technical Pneumatic tube Internal DIA 2mm External DIA 4mm compatible with lego for Kids Boys Toy|Blocks| - AliExpress
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LEGO Set 5102-1 Pneumatic Tube, 60 cm and 100 cm (1987 Service Packs > Technic) | Rebrickable - Build with LEGO
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