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Thread: Rusted/broken threads

  1. #1
    DIY Junior Member hudsonmudson's Avatar
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    Default Rusted/broken threads

    I am remodeling our kitchen. When I removed the drain pipe extending from the wall, I came upon rusted/non-existent threads extending out of an elbow fitting. The fitting is in a cinder block wall, so there is not room to rotate the elbow off and replace. The threads on the top are ok -- on the bottom only there is only about 1 cm left. Any advice on how to fix simply and effectively (if possible) would be much appreciated.

    Thank you.
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    Last edited by hudsonmudson; 11-19-2009 at 03:52 PM.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default drain

    Unscrew that piece of pipe, or have a plumber carefully cut it out of the fitting and insert a new pipe.

  3. #3
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    I would use heat to expand the fitting so the nipple will come out easier. Hopefully it doesn't crush or break when you try and remove it!

  4. #4
    DIY Junior Member hudsonmudson's Avatar
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    Default

    Thanks for the answers. Besides heating to make it come out easier, what is the best way to remove the pipe w/o damaging the threads of the female elbow?

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default elbow

    That is a cast iron elbow so the threads are pretty durable. Careful application of a hammer and small caping cold chisel will remove it. The keyword is "careful" which is why I recommended that a plumber, who has done it before, do it. From the looks of it, I think I could remove it in about 2 minutes, but that is because I have the right tools and know how to use them.

  6. #6
    Plumber Cass's Avatar
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    I would cut the peice of pipe heading left and install a banded coupling with a new PVC 90 because you already have the wall open...

  7. #7
    DIY Junior Member hudsonmudson's Avatar
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    Default It's out.

    Thanks for the advice. It ended up being much easier than I thought. I sprayed some PB Blaster and let it soak for a bit. Then I took some vice-grips and managed to work it loose without much trouble at all. The inside threads are fine.

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