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Thread: Helping a friend with plumbing

  1. #1
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    Helping a friend with plumbing

    A friend asked me to help him with a plumbing problem. The copper drain line from the kitchen sink into the basement was leaking a a fitting up in the joist space along an outside wall. I was able to remove the piece of piping in question, but had to cut the horizontal drain pipe in the basement. We decided to use 1-1/2" pvc from the trap to the basement to clean up the convoluted plumbing under the sink. The problem we ran into with this plan is the copper pipe is 1-5/8 OD. We can't find a fitting that will connect the pvc to the copper. I'm open to suggestions on how make a reliable long lived connection.

    1-1/2" pvc compression fittings won't accept the 1-5/8 copper.
    Last edited by Lee Schierer; 09-18-2023 at 7:41 PM.
    Lee Schierer
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  2. #2
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    Quote Originally Posted by Lee Schierer View Post
    A friend asked me to help him with a plumbing problem. The copper drain line from the kitchen sink into the basement was leaking a a fitting up in the joist space along an outside wall. I was able to remove the piece of piping in question, but had to cut the horizontal drain pipe in the basement. We decided to use 1-1/2" pvc from the trap to the basement to clean up the convoluted plumbing under the sink. The problem we ran into with this plan is the copper pipe is 1-5/8 OD. We can't find a fitting that will connect the pvc to the copper. I'm open to suggestions on how make a reliable long lived connection.

    1-1/2" pvc compression fittings won't accept the
    Is there a rubber band clamp fitting you can use to transition? Brian
    Last edited by Jim Becker; 09-19-2023 at 10:04 AM. Reason: fixed quote tagging
    Brian

  3. #3
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    I think your 1 5/8" OD copper is actually nominal 1 1/2" copper pipe so you might be able to use a 1 1/2" copper to 1 1/2" PVC rubber connector as Brian suggested. Best bet is to go to a plumbing supply store rather than a big box store to get advice on the correct fitting. The fact it is a drain is in your favor, a pressurized pipe connection would be more likely to fail if not perfect. If it was smaller a Sharkbite fitting would be the way to go but I don't think they come that big.

  4. #4
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    Fernco has got to make something that will work! Take your two pieces of pipe to real plumbing supply store (eg not the Borg) and ask them for an appropriate coupler.

  5. #5
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    1-1/2Ē copper female threaded adapter to male PVC adapter. I donít use female plastic threads for anything.

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  7. #7
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    I second the two suggestions above. Either sweat on a copper female threaded adapter to the existing copper, then screw in a male PVC adapter, (more work), or use a Fernco of appropriate size (much less work).

    And don’t think that Fernco is somehow a “shortcut” or “less permanent solution.” They’re used all the time in commercial settings for sewer line repairs, and water supply line repairs (under pressure).
    Jason

    "Don't get stuck on stupid." --Lt. Gen. Russel Honore


  8. #8
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    I think the fernco is the best option. Its easy.
    How far does the copper go and does it transition into something else? cast/pvc/ etc? if it goes a little farther and transtions into something else I would take the pvc all the way there.

    You can definitely transition to thread to make the connection. But thats extra joints and threads have a greater chance of leaking over the fernco
    You can use one of these but youd have to be gentle soldering the fitting
    https://www.supplyhouse.com/Sioux-Ch...ss-Fit-Adapter

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  10. #10
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    I have been pleased with Fernco products I have purchased and used.
    Ken

  11. #11
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    Quote Originally Posted by Ken Fitzgerald View Post
    I have been pleased with Fernco products I have purchased and used.
    Ditto. And plastic threads, my Mom had a house piped with CPVC, threaded plastic to metal faucets and They All leaked. I spent my visits replacing with copper to PVC fittings, Teflon tape of course.
    Retired Guy- Central Iowa.HVAC/R , Cloudray Galvo Fiber , -Windows 10

  12. #12
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    An Update

    Well, we purchased the Fernco and the fittings we needed for the PVC portion. We hooked it all up to day and had a leak on the first test right at the Fernco fitting on the copper side of the joint. Upon close examination, we noted The walls that the tubing had a fold originating under the Fernco. The copper is too thin along its entire link to support even mild pressure from the Fernco. The walls of the copper are less than 0.026 thick, so it either buckles or cracks. This piping has been in use since 1963.

    Plan B will be tried tomorrow. We will remove all the copper and sweat in a new copper pipe stub in the side of the 4" stack fitting. There is not sufficient metal for the Fernco to grip the 45 degree angled side inlet to the 4" copper stack. The top of the angled inlet fitting is only 3/8" long.
    20230919_150209.jpg
    Lee Schierer
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  13. #13
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    The only thing more fun than plumbing is fixing old plumbing. Good luck.

  14. #14
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    It is not code to hide a fernco inside a wall. they must be visible so any leaks can be seen easily.
    Bill D

  15. #15
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    Quote Originally Posted by Bill Dufour View Post
    It is not code to hide a fernco inside a wall. they must be visible so any leaks can be seen easily.
    Bill D
    As you can see in the photo in my update post, the Fernco fitting will be visible as it will be very close to the 4" sewer pipe.
    Lee Schierer
    USNA '71
    Go Navy!

    My advice, comments and suggestions are free, but it costs money to run the site. If you found something of value here please give a little something back by becoming a contributor! Please Contribute

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