Allows you to be able to ground a radiator or heater core from stray voltage and voltage producing electrolysis. It only allows voltage producing electrolysis to flow in one direction, out of the cooling system. Improper or direct grounding of cooling system components provides a pathway for returning or stray voltage to enter back into your cooling system and possibly making your electrolysis problems even worse.
Works great on aluminum radiators and heater cores that are mounted in rubber bushings or plastic tanks that are isolated from grounds.
Smart Ground Wire works best with the Rad Cap.