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Thread: Combination Wye On Its Back/Side

  1. #1
    DIY Junior Member philwgreen's Avatar
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    Default Combination Wye On Its Back/Side

    I was underneath the house the other day and noticed a couple of combination wyes in the plumbing on their backs/sides.

    I know there are differences on which fittings can be on their sides/back and I was curious if these were done correctly. We moved into the house about a year and a half ago and my best guess is that these pipes were redone about 5 years ago - but based on the previous owner's other handiwork I wouldn't be surprised if the entire DWV system is wacky.

    First one is the drain from a bathroom sink. The vertical continues as a vent through the roof.

    On the second, if you can look past the mess of romex (another project for another day) two toilets connect into the main stack with a combination wye on its side.

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  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Default

    A combo is the same as a Y and 45. Perfectly fine.

    John

  3. #3
    Test, Don't Guess! cacher_chick's Avatar
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    Default

    The combos are fine. A sanitary tee would be improper.

    The strapping used is a bit hokey, as is the NM wire that could use some cable staples.

  4. #4
    DIY Senior Member asktom's Avatar
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    The fittings are installed correctly.

  5. #5
    DIY Junior Member philwgreen's Avatar
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    Thanks for the replies!

    If you think the strapping and NM look hokey - you don't even want to see the rest of the basement! We gutted the upstairs and started over - it was bad.

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