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Thread: How water pipe sizing question

  1. #1

    Default How water pipe sizing question

    I'm putting a dual vanity where there was only a single and moving my toilet and tub/shower in my upstairs bathroom. While I'm doing all that I'm just replacing all the Polybutylene pipe with copper.

    Is attached a primitive map of the current plumbing. The thicker lines are 3/4" pipe and the thinner ones are 1/2". I guess I'm surprised that the hot water line for both showers is just a 1/2" pipe. Is this correct or should I run 3/4" supply over there and then T off to two 1/2" lines?

    Thanks for any help you all can offer!

    - Jeremy
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  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Aug 2004
    Bothell, Washington
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    The shower is 2 units, the tub is 4 units.
    You can have 6 units on 1/2"

  3. #3


    Thanks. That is what I was looking for!

    - Jeremy


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