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Thread: Modify drain line, maybe

  1. #1
    DIY'er carrud's Avatar
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    Default Modify drain line, maybe

    The 3" drain line from the 2nd floor runs down my shower wet wall. This is cramping me with my desire to center my new shower valve which uses a Grohe GrohFlex rough-in. This new one is much bigger than the original valve.

    Do I have any plausible options to, perhaps, add a couple soft bends to the 3" drain to offset it around the valve area and then bring it back to tie back into the location where it drops into the slab? Or any other idea?

    The valve needs to be to the left of the that drain line.

    The last pic shows approximate desired location in relation to the drain line.

    Many Thanks, Clark

    Name:  !!Drain from 2nd floor IMG_0549 copy.jpg
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    -Clark

  2. #2
    DIY Senior Member bluebinky's Avatar
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    Unless the room is really cramped, I would just fir out the wall behind the shower another inch or two.

  3. #3
    DIY'er carrud's Avatar
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    Interesting option. I don't think taking a couple of inches works well in this room, but I'll give it proper consideration in the morning light. However, to me it seems a better option to be adjusting the drain if it seems reasonable. I'll think about this.

    Thanks for the response.
    -Clark

  4. #4
    In the Trades Tom Sawyer's Avatar
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    Looks like 4 1/8th bends should offset it enough.
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  5. #5
    Forum Admin, Expert Plumber Terry's Avatar
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    I would remove the sagging rubber Fernco coupling above and replace withe a no-hup coupling. It needs the metal wrap to keep the pipe from sagging. Rubber doesn't support the weight of Cast Iron pipe.
    We can only use a coupling like that if it's fully supported in the ground.

    Not too many plumbers would consider offseting a cast iron stack to center up a shower valve. I've seen plenty of shower valves installed off center on purpose to make it more convenient. Centering the shower arm makes sense though.

  6. #6
    DIY'er carrud's Avatar
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    Terry, thanks for catching and explaining about the sagging rubber Fernco.
    -Clark

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