Several years ago,I believe Roto-Rooter was the company; provided customers with an automatic natural gas shut off valve which was installed at the main gas meter. During an earthquake of a specific magnatutide, the device would automatically shot off the gas serving the building, therefor eliminating any possibilities of natural gas leaking into the building from broken gas lines and cutting the odds of a fire starting. The company dealt with uncloging sewers and serviced other plumbing problems, however they did supply and install this automatic device.
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