Changes

[http://www.youtube.com/watch?v=P-Lk-GJtTbM How to make a Tippy Tap]

*[http://www.wot.utwente.nl/publications/tippy-tap.pdf IRC, The Netherlands]

*[http://www.youtube.com/watch?v=OvSc_7h9w6g Different model, movie bij Zenrainman]

*[http://www.appropedia.org/Handwashing#Appropriate_Technology_Handwash_Station.2C_Thailand Appropriate Technology Handwash Station, Thailand] - foot-operated, similar to the model shown here.

==References==

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