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    ttj2010's Avatar
    ttj2010 Posts: 2, Reputation: 1
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    #1

    Nov 12, 2010, 09:47 AM
    What if the drain pipe is to low for the p-trap?
    Bought a new vanity with drawers on the bottom and the drain pipe into the wall is too low to match up to the end of the p-trap.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Nov 12, 2010, 10:51 AM

    Then you must get a drain extension to lower the trap. I am guessing by your info the drawers may be in the way, right? Have you installed the vanity yet?
    ttj2010's Avatar
    ttj2010 Posts: 2, Reputation: 1
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    #3

    Nov 12, 2010, 11:06 AM
    Comment on ballengerb1's post
    No I didn't because I knew I may have to do some more work to the pipes behind the sheetrock
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #4

    Nov 12, 2010, 12:53 PM

    So will adding a longer drain tube straight dow so the trap matches the wall cause an issue with that drawer?
    argaiu1017's Avatar
    argaiu1017 Posts: 92, Reputation: 8
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    #5

    Nov 12, 2010, 08:25 PM
    Hi,

    I am assuming u have a 1 1/2" p-trap? What u have to do is buy an extension tailpiece that attaches to the inlet of trap so u could drop it to the height of drain.

    Or open wall and raise the santee.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #6

    Nov 12, 2010, 08:32 PM

    Don't assume anything with plumbing, a bathroom vanity has a 1 1/4" drain and trap. We are still waiting to hear if the drain extension will interfere with the drawer, I think it will.
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #7

    Nov 12, 2010, 08:37 PM

    Hi all...

    Answer Ballengerb1's question, please.

    I agree, as Ballengerb1 said, "Then you must get a drain extension to lower the trap."

    Argaiu1017 then said, "what u have to do is buy an extension tailpiece"...

    Clearly, if the issue is only drain height, the best bet is to purchase an extension tailpiece... see images (metal or plastic)... :)

    They even make FLEXIBLE extension tailpieces (see bottom image)!

    You'll either need an 1-1/2" extension tailpiece with an 1-1/2"x1/1/4" nut and washer or you'll need an 1.25" extension tailpiece. Here, as Ballengerb1 pointed out, the pop-up assembly that came with the faucet will be 1.25"... your PTRAP is 1.25" or 1-1/2"... just need to adapt to one or the other... hope that makes sense?

    Otherwise, let us know more, OK?

    Mark
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    argaiu1017's Avatar
    argaiu1017 Posts: 92, Reputation: 8
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    #8

    Nov 12, 2010, 09:17 PM
    Comment on ballengerb1's post
    Standard rough in for lav is 1 1/2" trap and decrease to 1 1/4" to pop up. Yes 1 1/4" is minimum on a lav according to code because it is a 1 fixture unit fixture.

    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #9

    Nov 13, 2010, 06:03 AM

    standard rough in for lav is 1 1/2" trap and decrease to 1 1/4" to pop up
    That's true if you're dealing with PVC or ABS but if you're coming off cast iron the trap will be 1 1/4 inch chrome.
    Here's another tail piece extension, (see image) Good luck, Tom
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    argaiu1017's Avatar
    argaiu1017 Posts: 92, Reputation: 8
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    #10

    Nov 13, 2010, 11:40 AM
    Comment on speedball1's post
    Hi,
    Cast iron or not, they make 1 1/2" brass tubular trap and used in every homes or commercial especially
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