If you use the teflon tape or lubricant compound, and tighten it down until in gets hard to turn, you probably have it tightened correctly. I still have that 1/8 to 1/4 of threads showing on my anode rod,and it doesn't leak. Pipe threads are somewhat tapered, so they are not meant to tighten down until you don't see threads any more. With that size socket, it is very easy to over torque.
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