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    clwguy's Avatar
    clwguy Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Oct 22, 2009, 03:19 PM
    1-3/8" bath vanity drain pipe?
    I am replacing my bathroom vanity and ran into a problem with the plumbing. I removed the p-trap because it has corroded -- it was soldered to the wall drain; I unsoldered it.

    I bought replacement p-trap kits with compression fittings but neither the 1-1/4" nor the 1-1/2" fit. The 1-1/4 is too small and the 1-1/2 is too big! I measured the wall drain and it's 1-3/8"

    So what do I do now. Is there such a thing as a 1-3/8 to 1-1/4 connector?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Oct 22, 2009, 04:59 PM
    There are no 1 3/8ths ID drain pipes. Lavatories are 1 1/4". Can you post a picture of what you're trying to do. Tom
    clwguy's Avatar
    clwguy Posts: 6, Reputation: 1
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    #3

    Oct 22, 2009, 07:34 PM

    Here is a pic.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    Oct 22, 2009, 09:28 PM

    This is based on my assumption that the pipe you removed went in the exposed hole. I could be wrong.

    Another possibility, is that it's a piece of 1-1/4 tubing that was cut soldered into a copper elbow. In that case, there probably isn't enough room to put a slip joint on there.

    If you have a copper female adapter screwed into a pipe in the wall. A 1-3/8 OD tube would translate to a 1-1/4 copper tubing. I know, you think we are pulling your leg? Nope. See table here: Copper Tubes Type K - Dimensions and Physical Characteristics

    Here's a place to look: Tubular bathroom drain products and p-traps and sink drains from FAMOUS PLUMBING SUPPLY


    Once you solder a small piece of copper pipe in there, you can use a 1-1/4 slip joint.

    It might be too difficult to remove the threaded adapter. Fernco's start a 1-1/2"

    You can put a copper reducer in there to increase the pipe to 1-1/2" and add a short length of 1-1/2 copper. Now you can connect via 1-1/2" slip or use a Fernco coupling. (A rubber fully shielded metal outside coupling).

    I hope Tom has a better idea.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #5

    Oct 22, 2009, 09:46 PM

    You have 1 1/4 copper drain. You don't see them too often in the field. You have two options:

    1. Buy 1 1/4 copper male adapter and solder it onto the existing stub out
    2. Buy 1 1/4 rubber FlexSeal coupling with 2 s.s. bands. Attach one end to the copper stub out and continue with your new plastic drain installation. (See the photo )
    Attached Images
     
    clwguy's Avatar
    clwguy Posts: 6, Reputation: 1
    New Member
    		  
    #6

    Oct 23, 2009, 07:37 PM

    Thanks for the replies. I went and got a 1-1/4 Flex Seal. It worked great. My only concern is that I can't see if it leaks. The back edge is pretty much right at the wall hole and in fact a little in. Is there any tricks for seeing if it's leaking inside the waii?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #7

    Oct 23, 2009, 09:11 PM

    A piece of paper wrapped around the circumference and running the water.
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