Sac Dave wrote:
"Big Al" wrote in message
...

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


Brass is neutral metal and will work.




I'd love to hear what makes you think brass is a "neutral metal", Sac Dave.

Have you ever even bothered to look at a galvanic table?

Try spending some time reading articles like this one:

http://tinyurl.com/5sekem

before you hand out totally incorect advice.

*******

Regarding the OP's mention of water heaters, the use of dielectric
unions on them is passe, as stated by Rheem in this bulletin:

http://tinyurl.com/5e56ub

Jeff

--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.98*10^14 fathoms per fortnight.