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Thread: Toilet Drain PVC Pipe Size

  1. #1

    Default Toilet Drain PVC Pipe Size

    I am currently in the process of moving the existing rough in toilet drain pipe in my basement. I need to move the toilet 12” to the left. I have rented a jack hammer and I have removed the concrete and gravel and I have exposed the 3" drain pipe. The pipe originally went from a 3” to 4” using 90 degree and that left a 4 “pipe exposed in the floor. When connecting a new 90 degree and a 45 do I have to go back with a 4 inch pipe to the flange or can I use all 3”. What is the purpose of the 4” section of PVC PIPE?”
    Last edited by Terry; 12-15-2009 at 04:20 PM.

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default 4"

    It is called a 4" x 3" closet bend and is the only way I ever rough in a toilet. Many use 3" pipes with no problems. So it is up to you.

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