Connecting copper pipe to galvanized pipe


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Old 08-10-16, 12:42 PM
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Connecting copper pipe to galvanized pipe

I have a 1/2 copper npt female connector at the end of my pipe run. I want to connect an hose bibb. Can I use galvanized npt pipe and thread it into the copper?
 
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Old 08-10-16, 12:54 PM
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IMO, it would be better to install a dielectric union between the two.
 
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Old 08-10-16, 01:38 PM
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It would be better to use a PVC pipe with threaded adapters attached to accommodate the copper and the hose bib.
 
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Old 08-10-16, 06:28 PM
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As the others have mentioned you need to have some type of separation between the dissimilar metals other they will corrode between them. The further the separation the better. A dielectric union the give some separation but adding dielectric nipple in addition to the union is better. Here is why:

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Old 08-10-16, 06:39 PM
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I was thinking more along these lines.



Use two of these with a piece if PVC between them. all you need to do is glue it.
 
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Old 08-11-16, 10:02 AM
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Like others have said, I would stay away from galvanized pipe completely. Depending on your water chemistry, the nipple could start corroding in months, or it may last years. Regardless, there are better answers:

You can use copper (male threaded to 1/2" copper to female threaded) (my choice)
You can use PVC with the same setup
You can use a brass nipple if it's just a short nipple you need
 
 

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