Toilets, Sinks, Showers, Tubs and Disposals - toilet pipes

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bubbaq402
05-11-07, 10:40 AM
what is the best diameter pipe to use for toilet drainage?


CSG
05-12-07, 01:22 AM
The standard is 4". But 3" will work fine. I don't recommend going less then that.

And when i say 4" i mean from the 90 up. The drain pipe itself can be 3" which is the normal..then you attach a closet bend at then end (a 3"x4" 90) and bring 4" up to the flange. As i said though, you can use a 3" 90 and bring 3" up to the flange and that is fine as well.