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i have more cool videos at http://www.youtube.com/user/abcdefg56758?feature=watch
You can use 2 one way valves from fish tank air pumps or windscreen washer system, pipe from syringe to a 2 way splitter to each valve, them being the opposite way round.
Found one on here: http://www.instructables.com/id/Simple-Syringe-Pump/

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