venturi effect - Siphon Action Demonstration

Blow-to-start siphon

 simple tool to create a siphon using two tubes. It uses [venturi effect] (https://en.wikipedia.org/wiki/Venturi_effect) to create a vacuum.
Useful when you want to transfer liquids and you don't want / can't inhale (ex: aquarium water, fuel...). You just need to blow into the tube to start it.