A Google search using the phrase "emergency gas shut off valve" gives lots of results. This might be a place to start getting information. I would also suspect there would be a permit requirement, so a call to the county building department might be in order. The local gas company probably also has this information, and may have some specific requirements also.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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