Closet bend or 90° elbow

[pmfleisch]

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?

 

[Asktom]

In plastic they are the same, in cast iron they are different.

 

[Sponsor]

 

[hj]

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.

 

[DavidTu]

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.

 

[hj]

IF you have the room, either one is permissible. I prefer the closet bend because it is "tighter".