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Old 07-27-2015, 05:43 PM   #1
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Dielectric question


If a dielectric union is necessary where let's say 3/4" galvanized to copper to supply a bathroom or whatever, how come I have seen many drawings call for a threaded drop ear to a galvanized nipple, like in a shower, with no mention of any dielectric anything? I'm totally new to plumbing, so please be nice, lol.
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Tom
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Old 07-27-2015, 05:53 PM   #2
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Not sure where it is your looking, but the only time I use a cheap steel nipple and a cap is before the final plumbing is installed.
It's just there to line up the hole and make sure no one turns on the water by accident.
Once the walls finished it comes out and a chrome plated brass curved pipe goes in.
If you have old steel plumbing it needs to go ASAP.
At some point it's going to rust out and leak from the inside out, and close up on the inside.
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Old 07-27-2015, 06:00 PM   #3
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Brass and steel go together ok, but not copper to steel.
But I'll go a step further and say that UPC allows dissimilar metals (copper to steel) without dialectic unions- as long as it remains accessible. Just not a good practice to mix steel and copper....
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Old 07-28-2015, 07:47 AM   #4
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I think both ways are acceptable. There is one spot in my house that transitions from galvanized to a threaded brass elbow, with copper soldered onto the other side of the elbow. It was done long before I bought my home and it is holding up just fine over the years.

Anytime I am connecting galvanized to copper, I prefer to use the dielectric unions. Just my preference not to have the metals touching, but above all else the union is more easily serviceable if there is ever a leak....you can't tighten a brass fitting if you have already soldered onto the other end of it.
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