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I'm replumbing a home, and I have a quick question of when/where to use a dielectric fitting. The water main is coming through a bedroom, outside the interior wall. Starts galvanized from floor and goes to brass shut-off valve about midway. Trying to replace the easier galvanized with pex, but I want to avoid the UV exposure on pex, so completing the bedroom part of the run with copper until it gets to the attic.

So the entire run will be galvanized --> brass fitting (shut-off valve) --> copper --> pex. I know I need a dielectric fitting here, but would it be between the galvanized and brass, or brass and copper? Thanks

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  • A picture of where the water line comes in would probably be helpful, because your description has me lost.
    – FreeMan
    Jul 27, 2023 at 11:17
  • Unfortunately, I'm out of town for the week, so I can't take a photo. But I guess, to simplify and assuming I can't remove the galvanized, where in a galvanized to brass to copper plumbing run do I need to put a dielectric fitting? Thanks
    – Pstruder
    Jul 27, 2023 at 13:49
  • youtube.com/watch?v=6eqKsYw-2cI
    – ron
    Jul 27, 2023 at 14:13
  • between steel and copper/brass
    – ron
    Jul 27, 2023 at 14:13
  • youtube.com/watch?v=5thvA9dsQmQ
    – ron
    Jul 27, 2023 at 14:14

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