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Thread: Tub Spout Pipe Type

  1. #1
    DIY Junior Member Big Papa's Avatar
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    Default Tub Spout Pipe Type

    Is there a law or regulation that requires a specific type of pipe to be used for the tub spout to connect to ? Main question is can CPVC be used instead of galvanized or some other metal pipe ?

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    I don't think there are any professionals installing galvanized steel pipe anymore. CPVC is too flexible and/or likely to snap off under pressure. The inside diameter is also smaller than copper.

    For a solid installation, stub out a piece of copper or thread in a brass nipple.

  3. #3
    Plumber jimbo's Avatar
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    If this is a tub/shower set up,virtually every manufacurer speficies you may NOT use CPVC or PEX for the spout connections. The reduced inside diameter reduces flow rate, and will cause leakage from the shower head while using the tub.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    YOU can use anything you want to, but the results can be unsatisfactory.
    Licensed residential and commercial plumber

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    If the inspector is good, codes generally require fixtures to be installed per code, and per the manufacturers' instructions...none accept plastic for a tub/shower to the spout.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Forum Admin, Expert Plumber Terry's Avatar
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    I've been meaning to put a video that I took of plastic piping to a tub spout. It was PEX in that case and it was forcing water out of the shower head.

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