It doesn't matter if you use just one wrap or two of teflon tape, or wrap it so thick you can barely see the threads or anything in between. Then tighten it, it drips, makes it tighter, still drips, tighten until it can't physically tighten anymore and the elbow just bends without tightening and still drips. Drip is not slow either. Wipe away the drip and it will be flowing again in less than a minute. I suspect the threads aren't NPT, maybe NPS (non-tapered). Maybe they are BSP. Simply bad.
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