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Thread: sink drain with washer drain ?

  1. #1
    DIY Member tregg's Avatar
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    Default sink drain with washer drain ?

    I'm remodeling my kitchen. In the basement the washer drains into a vertical 2 1/2" pipe that stands about 4 feet tall. Is there a problem with running the new kitchen sink drain into that also? I can put a Y on top. Thanks!

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    You can't dump an upstairs fixture into the top of the downstairs fixture.
    It siphons the p-trap.

    Any would would need to come in below the tee and p-trap.
    The vent for the downstairs fixture would need to tie into the vent above at 42" above the floor.


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