For gas line fittings, the Harvey 017065 Gas Line PTFE Thread Seal Tape is a solid choice because it seals well and is specifically designed for natural gas, propane, and butane lines. This tape is made from PTFE, so it handles high temperatures, pressure, and chemical interactions.
From what we found, many folks using this tape on straight threaded gas line connections have had great results, including on gas solenoid valves. Just a heads-up, though—it's not meant for flare fittings since those don't generally need sealant.
When you use the Harvey 017065 tape, it seems like wrapping it around the threads about four times usually does the trick. Be sure to leave a couple of threads bare at the end. This helps make a strong seal without tightening too much, which can cause leaks.
Also, keep in mind that there's an important note about regulations. One plumber mentioned in our research that using PTFE tape wasn't up to code for a gas stove installation in their area. So, it's a good idea to check your local building codes before using it to make sure you're doing everything safely and by the book.
And lastly, when you're applying or removing the tape, you might find small bits sticking to the fittings. It's best to clean those off properly to keep the seal in good shape.
Overall, the Harvey 017065 tape can be really effective for preventing leaks in the right gas line fittings if you follow the right steps and check that it's allowed by your local regulations.