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Pneumatic controled Lego Technic Great Ball Contraption (GBC) module by Parda.
It has 3 pairs of sinchroniced pneumatic cylinder-valves who control another pair in the 1-2-3 order as the name of the module is.
Feeded by a independent compressor powered by a Power Functions M motor (PFM) and two minipumps that allow the module perform 10 cycles per minute.
Find more information, GBC modules and lots of other Lego Technic stuff at: