If you're looking to connect a few fittings or hoses together for a natural gas or propane application, then you'll need a little Slic-Tite.
Oh, and don't you dare try and say, "I've got some tape that can do that" - That's a negatory on that one, sergeant. The only tape that can seal gas fittings is a special gas-rated tape (which most folks don't have in their back pocket).
Trust us, the last thing you want your gas appliance to do is to catch fire. Thus, a little pipe sealant can go a long way. Just snag a few packages of Slic-Tite and you'll be good to go for your natural gas installations.