The Tank › Included Heat Traps replace need for Dielectric Union › Reply To: Included Heat Traps replace need for Dielectric Union
Pictures on the AO Smith web site show plastic sticking out past the nipples, so maybe those will be OK. It sounds like a requirement for that plastic to act as a dielectric coupling insulator is that the female copper fitting must tightly contact the plastic. That way it seals out the water from the metal-to-metal thread contact area that would otherwise corrode from the galvanic reaction.
Perhaps you had better luck with the flex lines because they have rubber gaskets to seal out the water from the metal-to-metal thread contact area? Have you seen/heard that nipples, with a plastic liner, actually hold up over time?
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