The thread does not correspond to the specifications. You are too loose. These fittings were screwed onto my water heater inlets until they were completely to the bottom and not even remotely tight. No amount of Teflon tape or glue could compensate for their weakening. I bought another pair from a reputable source and in fact the quality fittings went down about halfway down the water heater inlet threads and started to tighten quite tight as tapered threads should. Disappointing because I didn't even realize I had to be careful with them until I tried them.
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