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The price for installation of a standard residential seismic gas shut-off valve (SGSV) is $539.97 plus tax. This includes a seismic gas shut-off valve, materials, required bracing, paint, pilot re-lights, and a 30-year valve warranty. Standard Installation is suitable for most homes with a gas pipe size ranging from ¾” to 1¼”. A larger pipe requires commercial valves. Send pictures of the meter and the surrounding pipe for a quote. Outlying areas may require a travel surcharge.