Alternative Recessed Floor Drain

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Garn, Feb 5, 2021.

  1. Garn

    Garn New Member

    Joined:
    Jun 5, 2015
    Location:
    Arizona
    I need a recessed floor drain like the one described at Family Handyman here:
    https://www.familyhandyman.com/article/laundry-room-plumbing-a-recessed-pvc-floor-drain/

    Here's their assembly:

    [​IMG]

    However, my 2" drain is ABS, and the sewer and drain adapter used in the above assembly isn't available at a reasonable price in ABS, so I thought this may work at least as well:

    The exact same 2" drain, which just drops in, so PVC is fine:
    https://www.supplyhouse.com/Sioux-C...oor-Drain-w-Screw-On-Stainless-Steel-Strainer

    Instead of the sewer and drain adapter, a
    4" x 3" Hub x Hub ABS DWV Reducing Coupling:
    https://www.supplyhouse.com/Nibco-I010000-4-x-3-Hub-x-Hub-ABS-DWV-Reducing-Coupling-5801R

    Instead of the 4" coupling and 4"-2" reducer, a
    3" x 2" Hub x Hub ABS DWV Reducing Coupling :
    https://www.supplyhouse.com/Nibco-I009800-3-x-2-Hub-x-Hub-ABS-DWV-Reducing-Coupling-5801R

    with a short piece of 3" ABS to connect the two reducing couplings.

    Do you see any problem with this assembly?
     
  2. wwhitney

    wwhitney Well-Known Member

    Joined:
    Mar 17, 2019
    Location:
    Berkeley, CA
    Why does the original assembly use an S&D adapter? The 2" drain you linked to says on the cut sheet its top diameter is 4-3/8", so it wouldn't fit in a 4" S&D hub (4-1/4" ID). But it would fit fine in a Schedule 40 hub (4-1/2" ID); I assume the stop in a 4" Schedule 40 coupling projects more than 1/16", so it would not fall through.

    Your build up sounds good to me, with one caveat. The drain says it fits over a 2" pipe or inside a 3" pipe. So with a 3" pipe segment into the top 4x3 reducing coupling, the drain body would extend into the 3" pipe. If it's an interference fit, it won't dry fit down all the way. In that case you could just use a 4" coupling instead (but the drain will be a little loose side to side, as 4-3/8" < 4-1/2"). Or maybe you could find a 3" inside pipe fit S&D drain body with the correct top OD.

    Cheers, Wayne
     
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  4. Garn

    Garn New Member

    Joined:
    Jun 5, 2015
    Location:
    Arizona
    Very helpful, Wayne; thank you!
     
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