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Thread: Bathroom sink plumbing question (very basic)

  1. #1
    DIY Junior Member eoren1's Avatar
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    Default Bathroom sink plumbing question (very basic)

    So our bathroom sink has been very slow to drain and I finally decided to do something about it. Figured one of the kids dropped a lego piece and it was wedged in the trap. Looked under, undid the trap and found nothing. I did note the perplexing design of the piping though. Wondering if there is any reason why I can't/shouldn't disassemble this thing and do a simple drop/trap/elbow/out setup. I have the clearance to lower the trap so it can then be at the height of the exit pipe (sorry, I know that's not the right term).
    Thanks in advance,
    E

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    Moderator & Master Plumber hj's Avatar
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    Someone went to a lot of trouble to make a very complex, and completely illegal, drain connection. It is the old story of someone thinking "anyone can do plumbing" if he has enough pipe and fittings.
    Licensed residential and commercial plumber

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    DIY Junior Member eoren1's Avatar
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    Thanks HJ.

    So can this 'anyone' undo the above and just get a longer straight PVC hooked to the trap and then elbow out?

    By the way, why is this 'illegal'?

    Appreciate the help for this newbie.

    E

  4. #4
    DIY Junior Member eoren1's Avatar
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    Reading a bit more, I guess this is a convoluted 'S' trap. Just ordered a new faucet/drain assembly as the one up top needed to be updated and will take out all of this piping and replace with a proper P trap.

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    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
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    A very good ideal !
    that look likes something the wizard of OZ would think of

    MACPLUMB 777

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  6. #6
    Plumber jimbo's Avatar
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    yes it is an S. Just use a longer tailpiece down from the sink so that the trap arm outlet goes straight to the wall.

  7. #7

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    Wow, I would replace it. I think that it might flow a tad bit faster but you never know.

  8. #8
    DIY Junior Member eoren1's Avatar
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    Well...in for a penny, in for a pound...right?

    Just ordered a new Moen Eva 6410 faucet and drain to replace the vintage 60's model attached up top. Just got back from HD with all the stuff I need to put in a nice clean P drain below. Nice Sunday project coming up.

    Thanks everyone!

  9. #9
    DIY Senior Member Hammerlane's Avatar
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    And why the need for the PVC? why not tubular?
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    DIY Junior Member eoren1's Avatar
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    So the project is done...sort of - need some help/advice

    I removed the old faucet and all PVC from below (man that was a PITA). Then installed the new faucet and piping. All seemed fine. Of note the PVC threaded into the discharge pipe with a 1 1/2" male threaded piece. I primed/glued at two spots and thought I was good to go. Turned on the water...okay.

    Then, at the point where the old setup would start backfilling the sink, I was now getting water out of the attachment to the sink drain. I disconnected everything and shined a light into the discharge pipe - clean to the turn. Reassembled and tightened as far as I could and ran water at a slow level...fine. Bit faster and the same thing happened.

    So I'm guessing the old S piping was to make up for something else happening 'down the pipe'. Think I'm stuck now and need to call my plumber but was hoping someone could chime in with their thoughts on what might be wrong.

    Thanks
    E

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  11. #11
    Consultant cwhyu2's Avatar
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    Waste line needs to be rodded out.

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    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
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    Last edited by Terry; 03-18-2013 at 10:12 AM.

    MACPLUMB 777

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    JERRYMAC@TROJANWORLDWIDE.COM


    35 YEAR MASTER PLUMBER, HEATING, ELECTRIC, DRAINS, FIRE SPRINKLERS, WATER HEATER
    AND BOILERS SINCE JAN, 1989

    281-706-1631 7 DYS A WEEK SALES AND TECH. SUPPORT
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  13. #13
    DIY Junior Member eoren1's Avatar
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    Hmmm....guessing that I've moved beyond the realm of DIY if I need to buy something more than a handheld version.

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    Moderator & Master Plumber hj's Avatar
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    Lavatory drains SELDOM drain fully when the faucet is flowing aerated water directly on to them. You can only tell if it needs snaking when the faucet is turned off with water in the sink. I would NOT have used sch.40 drain fittings, but that is just a personal preference.
    Licensed residential and commercial plumber

  15. #15
    DIY Member Gordan's Avatar
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    Not sure what you mean by "getting water out of the attachment to the sink drain." Do you mean where the sink tailpiece goes into the trap? If so, there should be a little plastic compression ring under that compression nut. If there isn't, it will leak. Your drain should be water tight no matter what happens in the sink. The tailpiece also does not appear to be going straight into the trap - looks like it's at an angle. Enough of an angle will definitely create issues with sealing.

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