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Thread: Can I roll a Wye to 45 degrees?

  1. #1
    DIY Junior Member Jeepnick's Avatar
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    Default Can I roll a Wye to 45 degrees?

    Phoenix AZ here (UPC).

    My main 3" drain line is quite deep. To tie the rest of the fixtures into the horizontal main, can I roll a Y up 45 degrees to make the other lines more shallow?

    Alternatively (or in addition to) can I use a 45 to make steep depth change and then level off before entering the Wye?

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    Yes. Ideally the inlet of a wye will be anywhere from right on top to 45 degrees to either side of the top. Given proper pitch, it can be rolled all the way down to 90 degrees from the top, but that is usually avoided.

  3. #3
    In the Trades Tom Sawyer's Avatar
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    short of rolling it upside down you can pretty much do anything you want with a wye. Cacher's explanation is good
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

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    Moderator & Master Plumber hj's Avatar
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    quote; Ideally the inlet of a wye will be anywhere from right on top to 45 degrees to either side of the top.

    There is absolutely NOTHING wrong with laying a "Y" on its side, therefore it can be rotated 180 degrees from one side to the other. HOWEVER, depending on which direction you will be going from the "Y" will determine what fittings to use because a 45 elbow will ONLY straighten it out parallel to the pipe if the "Y" is NOT on its side or perfectly vertical.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member Jeepnick's Avatar
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    Thanks for the responses! So now that we've established that a Y can be rotated 180 degrees, what about a 45 coming off of it? If I want to roll a Y up to 45 degrees, then put a 45 off of it going off to the side (to attached to a horizontal drain which will empty into the main) can I do that or does the code say no? Or is it a bad practice? Please see attached picture for reference:

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    In the Trades Tom Sawyer's Avatar
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    If it makes the angle you can most certainly go right ahead
    [B]No, plumbing ain't rocket science. Unlike rocket science, plumbing requires a license[B]

  7. #7
    DIY Junior Member Jeepnick's Avatar
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    Quote Originally Posted by Tom Sawyer View Post
    If it makes the angle you can most certainly go right ahead
    If it makes the angle... Meaning, if it makes the angle I need? Or if it makes a specific angle?

  8. #8
    DIYer, not in the trades LLigetfa's Avatar
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    I would think you need a specific angle so they would be one and the same.

  9. #9
    Moderator & Master Plumber hj's Avatar
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    The dynamics mean that if you want to go 90 degrees to the side the "Y" MUST be on its side. IF you want to go parallel to the main line, but at a higher elevation, it MUST be on its back. Any other angle between parallel and 90 degrees requires that the Y and 45 be "rotated" at specific angles to make the turn. IF the Y is on a "true" 45, then a 60 degree bend, (and they do NOT come in street pattern), will make a "perfect" 90 degree angle from the main at the higher elevation.
    Licensed residential and commercial plumber

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