Dielectric couplings
Posted by John Hammond on May 13, 1998 at 19:10:07:
While remodeling our kitchen it was determined that our house water supply was way too high in pressure. Consequently the inspector required us to install a regulator. This was done, but where there was once a di-electric union (neoprene gasket) there is the regulator. The supply from the street was replaced some time ago with copper and the entire house is galvanized (with the exception of the kitchen).

My quesiton is two fold:
1. Is the galvanic issue due to two dissimilar metals in contact with one another, or is it due to an electrical current that passes between them? Obviously brass nipples conduct electricity.

2. Are my galvanized pipes and water tank protected by having either a brass nipple or a bronze casting (pressure regulator) ?

Thanks in advance for the info.

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