DO NOT use Teflon tape under the compression nut or on flare threads of brass compression fittings (or a compression fitting of any other material)! Liquid or gas does not touch those threads.

Do I need tape on flared gas fittings?

Flare fittings are designed to be installed dry, and without sealing tape. Teflon tape will lubricate the fitting to make it easier to tighten, but it also lubricates the threads to make it easy to loosen.

Should I use Teflon tape on gas fittings?

When connecting gas pipelines and their fittings to a stove, grill or other connection, it is important to use Teflon tape designed for gas connections and not Teflon tape designed for water pipes. Teflon tape seals the gas fittings’ threads and keeps leaks from developing.

Can flare fittings be used for gas?

Flared outlets are used for gas and high-pressure lines, where even a little leakage can cause major problems if left unattended.

What do you seal gas fittings with?

Coat threads with pipe thread compound or gas-rated Teflon tape before assembling.

Why is thread sealing compound not used on flare connections?

Why is thread-sealing compound not used on flare connections? because you will not obtain a leak-free seal.

What type of sealant is used on gas line piping?

But for a gas line the No. 5 product is the recommended pipe dope to use. The No. 5 sealant actually hardens over time to provide a better seal of pipe connections.

What kind of Teflon tape do you use for gas?

Yellow PTFE tape (aka Teflon) is supposed to be used for sealing gas pipe thread, and white PTFE tape, for water.