Teflon tape for gas fittings, also known as gas-rated Teflon tape, is yellow in color and clearly states it is for gas lines and connections. The tape works on all gas line types, including butane, propane and natural gas lines.
Apply gas-rated Teflon tape only to the fittings' threads. Do not apply the tape to gas compression connections, the removable nuts and bolts used to connect two gas pipes together. Gas fittings are on the ends of gas lines and are not removable. Turn off all gas connections at the gas meter outside your home or business before disconnecting or attaching gas lines to appliances.
After applying the tape, connecting your gas lines and turning the gas back on, mix 2 teaspoons dishwashing liquid and 1 cup of water in a pot. Dip a cloth or rag in the soap solution and swab the solution on the gas fitting. If you see bubbles forming on the fitting, you have a gas leak. Immediately turn off the gas source and tighten the gas fitting. Then turn the gas back on and test the fitting again. If the solution is still bubbling, turn off the gas, disconnect the fitting and check the fitting for dirt, debris or damage. Clean the fitting thoroughly, and reapply gas-rated Teflon tape. Repeat the testing process. Have a professional replace the gas line if the soap solution continues to bubble.
If you use plumber's Teflon tape on gas pipe fittings, the tape will degrade over time and gas vapors will escape from the fitting. Plumber's Teflon is white in color and thinner than yellow gas-rated Teflon tape. Leaking gas pipes and fittings are dangerous and can cause an explosion. If you are uncomfortable applying gas-rated Teflon tape to gas fittings, contact a plumber or repairman specializing in gas connections and repairs to complete the gas pipe installation or repair.
