Closet bend or 90° elbow

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by pmfleisch, Jul 28, 2013.

  1. pmfleisch

    pmfleisch New Member

    Messages:
    7
    Location:
    Milwaukee
    Maybe a silly question here, what's the difference between a closet bend and 90° elbow?

    I know you can get a street variety, or a reducer, but if I'm staying at 4 inches are they the same thing?
  2. asktom

    asktom Member

    Messages:
    589
    Location:
    Victor, MT
    In plastic they are the same, in cast iron they are different.
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,255
    Location:
    Cave Creek, Arizona
    A "true" closet bend has sharp 90 degree turn, while an elbow has a longer radius turn. in other words, if you put a closet bend 4" under the floor, you have a 4" straight stub to work with. If you do that with an elbow, you might not have ANY riser to work with.
  4. DavidTu

    DavidTu Member

    Messages:
    239
    Location:
    Seattle, WA
    But... just want to be sure there is no requirement to use a closet bend nor a prohibition from using a 90-degree turn fitting? I am running 4" cast iron under the joists in a soffit--so there is room for a 90-elbow, a short sweep (CI), or perhaps a long sweep. Am I free to use any of these or is there some other code that comes into play--I read on another forum something about a 12" drop not being allowed under a WC??

    Thanks.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,255
    Location:
    Cave Creek, Arizona
    IF you have the room, either one is permissible. I prefer the closet bend because it is "tighter".
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