Question re: repair fitting

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by BigRob_NH, Aug 31, 2008.

  1. BigRob_NH

    BigRob_NH Software Engineer

    Messages:
    10
    Location:
    Nashua NH
    Good morning folks,

    I'm in the process of installing a new vanity top. pulled the old vanity top/sink out and have the new cultured marble top in place. The drain hole, of course, doesn't line up. I need to move it back about an inch. No problem, just use a repair fitting.

    I grab one and get ready to cut/install and I see that somebody's already beaten me to it and the existing plumbing has a repair fitting place. With not much pipe to work with i have no alternative but to cut out the old one and replace it. Heck, it's about an inch or so so my hole/tail pipe might just line up.

    Here is the issue.

    The pipe coming out for the horizontal run from my ptrap is now only about 3/4 of an inch. If I bury this in the repair fitting it's OK but of course my tail pipe doesn't line up straight with the ptrap. If I insert it only about 1/2 an inch, my tail pipe lines up nicely but, of course, the horizontal run from the ptrap is no longer buried in the repair fitting.

    I see the following as my options:
    1) insert the ptrap the 1/2 inch so that it all lines up. Cement in place.
    2) build a whole new ptrap.

    Frankly, I'd much rather go for 1) if it will be sufficient. Will a pipe inserted the 1/2 inch into the repair fitting be leak proof and sufficiently strong?

    Something tells me that 2) is the way to go but I doubt that, being a novice, I can get the new ptrap assembled and installed so that it fits as perfectly as the existing one.
  2. kingsotall

    kingsotall Plunger/TurdPuncher

    I'd go for confidence rather than wishful thinking. It won't cost much to redo the p-trap. Anytime fittings are barely holding on, even if cemented would leave me with a fair amount of burden that I am not willing to bear.
  3. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    Somewhere in the code it says that the pipe shall be fully inserted into the fitting.
  4. kingsotall

    kingsotall Plunger/TurdPuncher

    Seems like a good rule of them is insert it the same diameter as the male pipe's width. Surely there will be exceptions.

    Disregard the above statement ^^^
    More I thought about it, I don't know what I was thinking!
    Last edited: Aug 31, 2008
  5. Terry

    Terry Administrator Staff Member

    Messages:
    14,889
    Location:
    Bothell, Washington
    A p-trap is a few bucks.
    When we replace lavs in bathrooms, we throw away all the old stuff underneath.
    It is always a better job with a new trap that lines up.
  6. BigRob_NH

    BigRob_NH Software Engineer

    Messages:
    10
    Location:
    Nashua NH
    Thanks for the input folks.

    Ran down to homers and the parts to build a new one cost all of 7 bucks.

    Now all I have to do is cut/cement it properly.

    Have a great weekend.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,472
    Location:
    Cave Creek, Arizona
    trap

    Haven't a clue as to what you said, or what you are working with, but the correct way is to take it apart until you find a good spot to join to, and then redo it to there.
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