Water powered timers hidden in public restrooms

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This is a very clever type of automatic syphon that you find in urinal cisterns.

@mrmattandmrchay's video is here: https://www.youtube.com/watch?v=3So7W34KNV8
My syphon based binary adder video is here: https://www.youtube.com/watch?v=IxXaizglscw

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