(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 11 of 11

Thread: Rusted threaded end of drain pipe under sink

  1. #1
    DIY Junior Member TSGarp007's Avatar
    Join Date
    Dec 2012
    Location
    Virginia Beach, VA
    Posts
    10

    Default Rusted threaded end of drain pipe under sink

    I just posted about a shutoff valve in my bathroom. This post is about the drain pipe for the sink in the same bathroom. It is metal, (cast iron?, rusted galvanized?). When I removed the old sink and plumbing, it revealed this pipe end (linked photo here). It is rusted on the end with the threads and part of the threads on the bottom are rusted completely off. The pipe slopes slightly downward (into the room), although I'm not sure if that was the case before I removed the plumbing, maybe it was holding it up slightly.

    You can probably guess my questions...

    1) Can I just attach this to pvc piping using a fernco adapter or something like it?
    2) Does the rusted section of the pipe need to be cut off? -if so, best way for a diyer to do so?
    3) Even worse, do I need to go into the wall for bigger repairs?

    Thanks for the help. I hate the plumbing part, I just want to start laying tile, trim, etc!

  2. #2
    TROJAN WORLDWIDE SALES RP MACPLUMB 777's Avatar
    Join Date
    Aug 2007
    Location
    Houston, Texas, United States
    Posts
    632
    Blog Entries
    1

    Default

    That is a galv. Steel nipple that can be removed and replaced !

    MACPLUMB 777

    E-MAIL
    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
    Trojan Worldwide Web Site


     



  3. #3
    DIY Junior Member toebone51's Avatar
    Join Date
    Apr 2011
    Location
    LA
    Posts
    8

    Default

    It's an iron pipe nipple that is screwed into an iron or cast iron fitting in the wall. If you try to unscrew it, the threads on the fitting in the wall might break off. Then you have to open the wall. If you try to cut the threads off with a saws-all it could break whatever seal is in the wall.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,208
    Blog Entries
    1

    Default

    A sawzall or hacksaw will cut that pipe and it can be coupled too. Or you can unthread the pipe and replace the nipple.

  5. #5
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,671

    Default

    I have unscrewed 'hundreds' of those nipples, at least 40 on a job a few months ago. I had to use a 5' cheater bar on an 18" wrench for some of them but NONE of them broke the fitting and all the threads in the fiittings were intact.
    Licensed residential and commercial plumber

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    Location
    New England
    Posts
    21,433

    Default

    FWIW, before you take that out, put a level on it to see how it is sloped...it should slope down, into the wall slightly. If it goes the other way, you'll have water sitting at the low end and it doesn't work as well. Galvanized should all be removed when doing remodeling if at all possible, and replaced with plastic or cast iron.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,671

    Default

    quote; Galvanized should all be removed when doing remodeling if at all possible, and replaced with plastic or cast iron.

    They do not make cast iron threads nipples. It is probably screwed into a drainage tee which has "automatic" pitch in the thread. This is one location where galvanized should be used. A plastic male thread could snap off.
    Licensed residential and commercial plumber

  8. #8
    DIY Junior Member TSGarp007's Avatar
    Join Date
    Dec 2012
    Location
    Virginia Beach, VA
    Posts
    10

    Default

    Thanks everybody! Between this and the toilet supply line I may just hire a professional.

    Jadnashua: The pipe is sloped the wrong way, it slopes down into the room. How will a plumber fix this?

    I wish I knew more about this stuff, but I don't want to mess it up and ruin my entire reno project.

  9. #9
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,671

    Default

    quote; How will a plumber fix this?

    About the only way it could slope the wrong way is if it is screwed into an elbow, and in that case, the plumber will just rotate it upwards.
    Licensed residential and commercial plumber

  10. #10
    DIY Junior Member TSGarp007's Avatar
    Join Date
    Dec 2012
    Location
    Virginia Beach, VA
    Posts
    10

    Default

    I see, thanks. Plumber is coming tomorrow. I'll try to learn at least a little by watching. No doubt these issues will come up again somewhere else in my house!

  11. #11
    DIY Junior Member TSGarp007's Avatar
    Join Date
    Dec 2012
    Location
    Virginia Beach, VA
    Posts
    10

    Default

    Thanks everyone, we ended up taking the drywall off the lower half of the wall and replacing the galvanized piping with plastic (ourselves). The galvanized pipe was corroded on the interior with significant hair/rust/etc buildup. In the process we noticed the galvanized piping was slightly sloped the wrong way (both in the wall and after the 90 into the room). We over corrected of course, so the pipe coming out of the wall is sloped upward into the room, which caused a little more work getting the sink drain hooked up, but all done now. Thanks again for the help!

Similar Threads

  1. Fixing a badly rusted drain pipe
    By k9mlxj in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 10
    Last Post: 02-16-2011, 08:15 PM
  2. Sink drain rough-in... to 1960's era male threaded bronze?
    By dfv2 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 2
    Last Post: 08-03-2010, 11:54 AM
  3. Help - Galvanized drain pipes/vent pipe in 2 story home is rusted, broken, leaking.
    By mnalep in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 92
    Last Post: 07-08-2008, 06:52 PM
  4. Rusted Sink drain pipe
    By erthwrks89 in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 12-06-2005, 10:06 AM
  5. Threaded Pipe Drain Help Needed
    By ziggy96 in forum Shower & bathtub Forum & Blog
    Replies: 2
    Last Post: 09-10-2005, 01:31 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •