Dielectric Unions - Necessary?
I have searched this site and others to find information on whether Dielectric Unions are really necessary when joining copper and galvanized pipes. The problem; I have found conflicting advice.
In my own case I decided to use them after replacing galvanized for copper at the lav. But both leaked at the threads... exchanged those for two others they leaked, searched the web and found posts by people with the same trouble, also found posts claiming brass fittings between the confliting metals will do nearly the same thing.
Anybody have advice or experience with or without these unions before I go down the road with toilet and shower supply lines?
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Comment on speedball1's post
Nice & helpful answer. Thank you.