Connecting copper pipe to galvanized pipe


  #1  
Old 08-10-16, 12:42 PM
L
Member
Thread Starter
Join Date: May 2006
Location: IN
Posts: 61
Received 0 Votes on 0 Posts
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?
 
  #2  
Old 08-10-16, 12:54 PM
XSleeper's Avatar
Group Moderator
Join Date: Dec 2004
Location: USA
Posts: 29,280
Received 1,534 Votes on 1,378 Posts
IMO, it would be better to install a dielectric union between the two.
 
  #3  
Old 08-10-16, 01:38 PM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 11,422
Received 595 Votes on 532 Posts
It would be better to use a PVC pipe with threaded adapters attached to accommodate the copper and the hose bib.
 
  #4  
Old 08-10-16, 06:28 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 14,967
Received 597 Votes on 512 Posts
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:

Name:  dilectric nipple.jpg
Views: 766
Size:  42.1 KB

Source: Home Care Myths Busted! | The Family Handyman
 
  #5  
Old 08-10-16, 06:39 PM
Norm201's Avatar
Member
Join Date: Sep 2013
Location: United States
Posts: 11,422
Received 595 Votes on 532 Posts
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.
 
  #6  
Old 08-11-16, 10:02 AM
Z
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 6,299
Received 320 Votes on 286 Posts
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
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: