Next, I installed a flex line from the T-valve's flare connector to another flare connector on the logs. When I turned gas on at the new T-valve I saw a very small trace of bubbling between it's flare connector and the flex tubing and directly turned the valve off. The flex tube is as tight as is it will go onto the connector, and I did not use any pipe compound per instructions on the flex tubing.
Can I simply apply some pipe compound to the threads on the flare connector? Or, do I need to replace the T-valve and/or tubing:?
The flex tubing came with two 1/2" -> 3/8" flared couplers, so I could possibly replace the flared shut off valve a 1/2" -> 1/2" non flared T valve.