Q&A for How to Cap a Gas Line

No, it isn't dangerous if it's actually abandoned. If you smell any gas, then get the utility to address it properly. Don't go within 20-feet of the line with any open flame.

No. You need thick-walled threaded pipe for most anything that's concealed. The Pro-Flex may not even stand up to an unknowing gardener's shovel.

Yes, but make sure you cap it also, as a person could turn it on by accident.

You can't cut into a flex pipe, so you need to go beyond that and just under the shut-off valve; you can cap it from there. Make sure to turn off the main valve on the meter!

Wrap Teflon tape around the thread of the cap five times. Use yellow Teflon tape, which is rated for gas. You can also use Teflon pipe dope. Apply the dope evenly on the threads on the gas line. Do not use the dope and tape together. Use the appropriate cap. If the pipe is brass, use a brass cap.