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After things thawed out in Texas, I found that my kitchen sink will not drain. In checking the p-trap, I found the inside plumbing corroded and replaced all of it from sink drains (double sink) to stub-out. I have run a snake through the stub-out and down to what seems to be the right angle under the slab. I can not get past that, but there is nothing getting caught on the snake. I just can't get it to turn another corner.

I dug up outside, removing a concrete step for access. I have actually run a garden hose in about 10 feet downstream, and have another access hole 20 feet beyond, where I can see water running freely. I have tried putting boiling hot water in the sink and plunging. I sucked out a bit of grit and slime, but not much. I need an idea on how I can go upstream from the Y shaped access hole. Water left in the sink will drain overnight, with no sign that there is a leak. I.e., it must be seeping slowly through the pipe.

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  • If you can block the vent, then use a garden hose in the stub, or push it in further, to flush water through fast enough you might dislodge whatever... But if that is corroded as well then it’s a risk...
    – Solar Mike
    Commented Apr 4, 2021 at 18:51
  • Is the pipe in the slab cast iron drain pipe or is this plastic, i.e., PVC or ABS?
    – Jim Stewart
    Commented Apr 4, 2021 at 19:58
  • The pipe is cast iron. I was going to cut a hole with a hacksaw, but that is going to take a long, long time. The old pipes that I left behind all seem very sound. There is nothing more that I can remove by unscrewing- the stub-out is there to stay. I had to break some of the fittings under the sink to get them off. 70 year old house.
    – Joseph Filip
    Commented Apr 4, 2021 at 23:23
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    Stop before you cause unnecessary damage. Don't start sawing the cast iron drain pipes. If the cast iron pipe is sound, you don't want to damage it. A professional plumber can probably snake this.
    – Jim Stewart
    Commented Apr 5, 2021 at 11:04
  • What size is the pipe at the 90?
    – isherwood
    Commented Apr 5, 2021 at 13:23

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I think at this point, you should call in a plumber with a snake & camera to determine the problem with the drain pipe. Instead of cutting, flushing and making a big mess a plumber with a camera on his snake could quickly determine the problem and the fix needed. If you call in a professional tell him/her the size and type of the piping you are dealing with.

my 2 cents

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