If your home uses natural gas, you might wonder how to tee off an existing gas line without running the risk of starting a fire. First, you’ll want to turn off the natural gas at your meter first. Then find the old gas supply line. To know where it is located inside your home, look for a metal or wooden box marked “gas supply” or “exchange.” There are usually signs pointing to it in several places inside your home.

how to tee off an existing gas line

After turning off your gas mains and utilities, open up the “exchange” door or “gas supply” door inside your house. Look for a hole or crack in the door seal. Sometimes it’s just one little crack, but other times it will have several indentations in it. When you see these indentations in your door seal, this means you are about to cut into one of your gas lines.

You’ll need a hose with a cutting attachment on one end and a tape measure/screwdriver on the other. You will also need some Teflon tape or similar tape dispenser or liner to apply the tape around the flange and on the outside of the pipe line. Take a moment to inspect the area for any damage. If there is any damage to the pipeline, you must tape it up to prevent your tee off from causing any more damage to the existing line.

running gas line for stove

Once you’ve inspected the area, pull the old line out through the hole or crack. Make sure to clean up any leftover dirt before re-inserting it into the existing gas lines. It’s important not to re-insert the existing gas line directly into the same hole because that can cause a potential leak. Rather than inserting it through the hole in the floor, place the tee on top of the existing gas line and secure it with tape or some other tight fitting gasket. Then attach a threaded screw or bolt to the newly-installed tee.

Next, locate a good-sized area where you have room to cut the new line through. Make sure to use a long reciprocating saw with a cutting blade that has been sharpened. With the reciprocating saw attached to a good power supply and a good work area, cut along the edge of the pipe about two inches inside the existing gas line. Use the pipe cutting blade to cut the new line, and be careful to keep the blade well-cleaned. Do not cut any deeper than is necessary to provide enough room for the tea to be seated properly.

shut off gas line

As a final step, fill the remaining space between the newly-installed tee and the existing gas lines with sand, taking care to level the area. Then install a valve over the sand, fill in the remaining dirt and adjust the valve accordingly. Follow all the steps from the first step of this article carefully, and you will soon know how to tee off your gas lines.

Be especially careful when teeing new lines through older gas pipes because running the new line through an older system can cause serious problems. Older gas systems generally have a lower pressure than newer ones, so running a new gas line through an old system can cause damage to the pressure relief valve.

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In addition, there may be damage to the actual gas tank or a complication in the system that prevents the valve from closing. If none of these things are present, or if you are unsure about how to perform the task safely, contact a licensed gas plumber to help you learn how to tee off your new gas lines.

When you have successfully connected your new appliance to the new gas line, you should always reconnect the existing gas supply valve to its terminal at the same time. Make sure that you have also installed an approved thermostat in your home, and that it is open and shut at all times.

pipe cutting tools

A thermostat allows the supply valve to maintain the proper temperature for your new appliance. After successfully completing the installation process, you should make sure that all objects that were installed properly are securely in place. Installing gas lines correctly can help avoid future problems, so be sure to pay attention to every step of the process.