https://en.wikipedia.org/wiki/Earthquake_valve#Types_of_valve
https://www.socalgas.com/stay-safe/safety-and-prevention/earthquake-excess-flow-valves
http://www.earthquakestore.com/shutoff-valves.html
https://www.youtube.com/watch?v=bumZMCXKs2Y
https://www.google.ca/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=earthquake%20natural%20gas%20shut-off%20valves
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