Galvanized with copper

[Denray]

This can't be right?

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[fyrmnk]

Only if you like growing corrosion bushes.

[John Dirks Jr]

You would need a brass fitting between the copper and steel to be right.

[Mark P]

so brass does not corode like other metals?

[kurt]

Go here.

It's got the basic noble metal scale. Mixing metals that are farthest apart has a much greater chance for electrolysis. Sticking a brass nipple in there slows or eliminates the problem.

Some galvanized fittings have inner plastic sleeves to isolate dissimilar metals.

I wouldn't necessarily say the installation was wrong until I checked to see if the nipple was brass and the galvanized fitting lacked interior sleeves.

IOW, could be just fine.

[Mark P]

Go here.

It's got the basic noble metal scale. Mixing metals that are farthest apart has a much greater chance for electrolysis. Sticking a brass nipple in there slows or eliminates the problem.

Some galvanized fittings have inner plastic sleeves to isolate dissimilar metals.

I wouldn't necessarily say the installation was wrong until I checked to see if the nipple was brass and the galvanized fitting lacked interior sleeves.

IOW, could be just fine.

Interesting - Thanks Kurt.

[Denray]

I don't remember having seen threaded copper before. Thanks for all the replies.

[David Meiland]

First pic looks like a brass nipple between the galv and copper, but I would want it to be 6" long and it's not.

Second pic shows copper directly with galv, and the results.

[Jim Katen]

First pic looks like a brass nipple between the galv and copper, but I would want it to be 6" long and it's not.

Second pic shows copper directly with galv, and the results.

What's special about 6"?

[David Meiland]

Probably nothing, but when I worked in the Bay Area, the plumbing inspector that often came out wanted 6" brass nipples between galv and copper. I have no idea whether it was based on code, common practice, stuff that dead guys taught him, or what...

[Denray]

Ah, talk to your wife about that 6" question.