when to use NPT and when to use sweat

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by lmei007, Feb 24, 2014.

  1. lmei007

    lmei007 Member

    Sep 21, 2007
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    If you have threaded pipe, that would be one reason to use NPT
    When I'm working with copper pipe, I prefer soldering. It's one less thing to go wrong. And, at my age, I prefer anything that will assemble without pipe wrenches.
    I have to keep my wrists in shape for softball.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    The "pipe" you are working with usually dictates what kind of flange, or connection, you use. However, if you are working with steel pipe, you would normally only use a threaded flange. If you have copper then you can either solder the flange on, or convert to an adapter and screw the flange on. In this case, it would depend on what kind of flange you have.
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