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Thread: Can I combine brass/chrome and plastic p-trap segments?

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  1. #1

    Default Can I combine brass/chrome and plastic p-trap segments?

    I'm installing a pedestal sink in a tight alcove in a bathroom. Only about 4 inches of the horizontal drain pipe from the p-trap to the wall can be seen from any angle at all. Can I use a 1 1/4" plastic p-trap assembly for all of the hidden parts, and then use a chrome-plated brass wall tube or extension for the horizontal part going to the wall?

    If so, is there anything special I need to know about connecting the plastic to the brass? Thanks.

  2. #2
    Plumbing Contractor for 49 years johnjh2o1's Avatar
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    Why not just use a chrome P-trap? Using a plastic trap and a chrome extension is just going to add more joints that are not needed.

    John

  3. #3

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    Quote Originally Posted by johnjh2o1 View Post
    Why not just use a chrome P-trap? Using a plastic trap and a chrome extension is just going to add more joints that are not needed.

    John
    Since it's a very tight space, it's helpful to be able to install and remove the trap by hand rather than with tools. I'm not a professional plumber, so the only tools I have that fit the large nuts are huge wrenches. The sink pedestal and walls make using a huge wrench difficult, if not impossible.

    Can the plastic / chrome arrangement be made to work?

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    Plumber jimbo's Avatar
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    You can totally intermix tubular fittigs..plastic, plain brass, and chrome plated brass.

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    Moderator & Master Plumber hj's Avatar
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    The joint between the two materials MAY require a "huge wrench" to tighten it, although all that is really needed is a pair of Channelock pliers, even with all brass parts.

  6. #6

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    Thanks for the helpful replies. If I use a brass extension attached to the plastic p-trap, I think I can make the connection between the two with a plastic nut. I have room against the wall to use a big wrench to connect the horizontal brass extension to the drain pipe.

    Some of the washers and pipe designs look a little different between plastic and brass - some have plastic washers, some have rubber washers, some have flared ends and no washers. I didn't know if there were special considerations needed to mate the dissimilar pipes.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Just use what comes with the extensions.
    If it's brass and a brass nut with rubber washer, that works

    If it's plastic, with a plastic nut and plastic cone washer, that works.

    We use channel lock pliers.
    Or our hands.

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