On Nov 26, 10:06�pm, "Big Al" wrote:
Question: Have a 3/4" copper to galvanized pipe junction, has a 6" brass
nipple between them. Is this the proper way to do this to prevent
electrolysis?

Other than on a water heater, when would one use an electrically isolated
union? And why?

Al

should be dia electric union. the better question why havent ypu
replaced the galvanized ?? PEX is CHEAP and EASY TO WORK WITH!