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  1. #1
    Join Date
    Oct 2011
    Location
    Minneapolis, MN
    Posts
    780

    Default dumb question - threaded copper supply lines?

    I read that copper water supply tubes and fittings are not threaded. I'm obviously no plumber (or inspector for that matter), but this struck me as kinda fishy. I've looked around the forum and the 'net, and there seem to be exceptions, but is this what they are - exceptions to the "rule"?

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  2. #2
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: dumb question - threaded copper supply lines?

    Copper "Tubes" or pipes are not threaded, and the connectors are not threaded either.
    There are threaded fittings that connect pipe to plumbing fixtures.

    There is no reason (that I know) that you could not use threaded fittings to connect supply pipe, but why would you?

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  3. #3
    Join Date
    Oct 2011
    Location
    Minneapolis, MN
    Posts
    780

    Default Re: dumb question - threaded copper supply lines?

    I dunno - to be able to disconnect something in a space that didn't allow for a fitting? Or where the heat of sweating is a problem? But you're right of course, why thread when sweating makes a far better, cleaner seal. Thanks for setting me right.


  4. #4
    Join Date
    Apr 2008
    Location
    Western Massachusetts
    Posts
    536

    Default Re: dumb question - threaded copper supply lines?

    Well, even if you wanted to disconnect something you'd need a ground union to avoid having to dismantle the whole system to remove one section. It's much easier to just cut the tubing and then sweat on a coupling. As for the heat from the torch, I've found welding blankets to be somewhat useful in tight spaces.


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