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Earthquake gas shut-off valves, or seismic gas shut-off valves, are safety devices that attach to your natural gas line. When an earthquake hits, the valve automatically turns off the flow of gas. Earthquake gas shut-off valves can prevent gas leaks, which are especially dangerous after a quake due to the risk of fire and explosion.

A few factors determine the amount of time it takes to convert from an oil to a gas furnace, mainly adding in the gas lines, updating your appliances, removing the old oil system, and installing a chimney line. These projects can vary, but you should expect them to take at least two or three days to complete.

Capping a gas line costs approximately $125. The final price varies from $75 and $150 depending on your contractor’s hourly rate. To completely remove a gas line and cap it at the base can cost up to $250. Most contractors will charge a flat fee instead of by the hour since capping is often part of a larger project.

If your home uses more than one gas appliance, you'll continue to use gas, even outside of the heating season. Your water heater, gas stove and oven, and gas dryer will all use some gas, although typically much less than a furnace. Additionally, those appliances may also have a pilot light that is lit continually, using a small amount even when no one is at home.