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Thread: How much can a 3 inch drain tolerate?

  1. #1

    Default How much can a 3 inch drain tolerate?

    I am doing some remodeling. I currently have two bathtubs, a shower, three toilets and three sinks draining to one three inch (3.5" O.D.) main pvc drain pipe. I plan to add a shower and a sink. Is this a problem?

  2. #2
    DIY Senior Member plumguy's Avatar
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    Three toilets is the max on three inch. As long as you don't add another toilet you are fine.

  3. #3

    Default Another question

    Thanks plumguy.
    Just out of curiosity, what is the max permitted toilets for four and six inch drains?

  4. #4
    DIY Senior Member plumguy's Avatar
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    Off the top of my head I think 4" you can have something like 48 toilets. I do stand to be corrected! As far as 6" I have no idea don't use it much!

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