I had to replace a radiant gas fire, and there are 4 or 5 screwd joints in the gas pipe the supplies the fire, including the two in the restrictor elbow and a joint where the 1/4" pipe attaches to the fire. I usually see traces of old jointing compound on such threads. What is the best stuff to use? I have some yellow hermetite (engine gasket goo). I also have PTFE tape. Will either of these do, or do I need to buy some specific gas- sealant paste?
TIA
Al