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Thread: Is this an S-trap?

  1. #1
    Home Builder ckl111's Avatar
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    Default Is this an S-trap?

    This is the second drain in a month I've seen like this. Is it legal?Name:  drain.jpg
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  2. #2
    Moderator & Master Plumber hj's Avatar
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    YES, it's an "S" trap, and NO, it's not legal.
    Licensed residential and commercial plumber

  3. #3
    Home Builder ckl111's Avatar
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    Assuming that the drain line is properly vented in the wall, is there a problem with a long tailpiece connected to a low p-trap?

    I can only guess that it was installed like that for looks but I don't know how it ever passed inspection. This was in a two year old house so I would think it was done by the original "plumber".
    Last edited by ckl111; 11-09-2013 at 07:48 AM.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    In that situation, the longer tail piece is the way to go. Raising the p-trap above the vent like that creates a siphon of the trap, leaving it dry.
    The purpose of the trap, is to have a water seal against sewer gas in the home.
    Put the p-trap in-line with the vent, and add more tailpiece.
    Or...cut the wall and raise the santee in the wall.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    It could have been done like that to give more room under the sink, or the trap might have hit the shelf.
    Licensed residential and commercial plumber

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