How to connect metal pipe to PVC?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dereks, Jul 4, 2007.

  1. dereks

    dereks New Member

    Jul 4, 2007
    Seattle WA
    Under my bathroom faucet, there is a leak between the joint between the PVC P trap and the metal drain pipe that sticks out of the wall. A plumber estimated a replacement would be over $400, which is too much considering my low paying current job, so I'm trying to do it myself.

    I was going to buy a new PVC pipe and use PVC primer and cement to attach it to the metal pipe. Is this ok?
  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego
    You can't glue PVC to ANYTHING. You can solvent weld it to another piece of PVC. A connection to metal would usually have a nut and a nylon or rubber slip joint washer. The washer can easily be replaced.

    Do you have a digital camera,that you could take a photo of this and post it for us?
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  4. dereks

    dereks New Member

    Jul 4, 2007
    Seattle WA

    Here is a photo. This is the original PVC pipe (cleaned a bit) and the metal pipe from the wall.

    Disclaimer: I may use this photo to edit wikipedia so wikipedia police should not delete it. Thank you.
    Last edited by a moderator: Jul 5, 2007
  5. got_nailed

    got_nailed DIY Senior Member

    Jan 11, 2006
    I think what would be the best thing for you to do is pull it all apart and stuff a rag into the metal pipe in the wall. Drive to “big orange” or the “big blue” and talk to someone in plumbing.

    The plastic washers are not that hard to replace but you need the right one. For the washers you’re looking at a buck or two. To replace it all it should be under 25 depending on how much you replace.

    i wish i would have seen the pic. but i was still typing i think
    Last edited: Jul 4, 2007
  6. molo

    molo Member

    Sep 23, 2006
    Cold New York
    If all you end up needing is a slipnut with washer, then the plumber was expensive or you've got some other problems we haven't heard about. Did he look at the situation in person?

  7. GrumpyPlumber

    GrumpyPlumber Licensed Grump

    Jun 18, 2007
    Plumber, self employed
    Licensed Grump
    I see what I think is a metal "Desanco" nut about an inch off the wall.
    A plumber would likely replace the nut and Desanco washer and that might be the trouble. (IF lucky)
    If the leak is on the actual metal pipe, it'll need to be cut with a hacksaw and coupled with a "no-hub" clamp to the PVC (not as "pretty"), but it'll need to repiped with schedule 40 PVC & P-trap with cleanout with an 1-1/2" by 1-1/4" desanco fitting to adapt to the tailpiece that drops from the drain.
    Derek, if all else fails...get more estimates, unless there's a detail missed in your description, this is a relatively simple, in and out job.
    $400 seems a bit on the high side for a simple drain repair. (unless you're in Beverly Hills)
  8. frenchie

    frenchie Jack of all trades

    Dec 30, 2006
    Brooklyn, NY and Fire Island, NY
    Loosen the nut, take out the plastic washer, go to the hardware and buy a new one. Put it back together.

    I tried to post a link to an animation, didn't work. Something in the forum is blocking it...


    the missing letters are "do it yourself", but typed in as one word, with no spaces; for some reason, the forum software thinks that's a swear word or something. Terry?

    Okay, here's a different one:

    The slipnut fitting on the vertical pipe has probably slipped some, as well; you'll have to loosen & re-adjust its position, to get everything to line up.
    Last edited: Jul 4, 2007
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