I am hooking up a new set of LP gas logs in my wood burning fireplace. I had the plumber install a gas line to the fireplace when we built the home 2 years ago and it has a "keyed" shut off valve mounted in the side wall. To be safe, I installed a secondary 1/2" -> 3/8" T-valve with a flared connector where the line comes inside the fireplace for quick access. The line inside the firebox originally had a 3" nipple and a cap, but I replaced this with a 1" nipple to ensuse room for the gas log appliance. There are are no leaks to the new T valve using the soapy water test.
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.