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Even if you invested in the cost of a gas shut-off valve for your oven and other appliances, it’s a good idea to add a seismic shut-off valve as an extra safety measure. 

Gas shut-off valves for appliances are manual, meaning someone has to cut off the flow of gas. This leaves room for error, as you might not be home or might be too distracted to think about gas lines during an earthquake. An earthquake valve is automatic and will protect your home from gas-related disasters in the event of an earthquake.

The cost of repairing a gas leak depends on the type of leak, its severity, and how difficult it is for the repair technician to reach it. Some of the most common gas line repair costs, on average, include:

• Cap a gas line: $75–$150

• Gas system inspection: $150

• Pressure test: $75–$500

• Damaged or corroded pipe: $6–$7 per linear foot

• Repair gas leak: $120–$5,000

No, fixing or patching a hole in a gas line may not seal it completely. A patch should be a temporary solution because the damaged area will be weaker than the rest of the pipe, increasing the likelihood of future leaks. Therefore, if a gas line incurs damage, call a licensed plumber and have it replaced right away.

Any gas pipe can leak, especially if it’s old or isn’t properly maintained. However, even with a shovel, plastic pipes are more easily damaged by impact. That’s why it’s so important to have gas lines marked by the utility company before you begin digging for any reason. Some metal pipes, like black pipes, galvanized steel, and copper, aren’t as easily damaged by impact but can degrade over the years, leading to leaks.