Fernco Multi-tite donut won't seat 100%

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by sfphoenix75, Jan 30, 2011.

  1. sfphoenix75

    sfphoenix75 New Member

    Joined:
    Jan 29, 2007
    Occupation:
    Software Sales
    Location:
    Norwood, MA
    Hi folks,

    After wrestling for about 4 hours with a cracked length of 4" Cast Iron vertical stack, I finally managed to get it out. Only to encounter another issue...

    The fernco multi-tite donut won't seat in the CI hub 100%. It's got 3 ribs around it and then the top flange. I've got 2 of the ribs in all the way but the top rubber flange is flush with the hub only on one side. In other words, the 3rd ribbing of the donut is exposed on the other side.

    I spent over an hour pounding that thing and it was very well lubricated. The pipe and donut are very tight and firm. It doesn't appear to be leaking...not yet anyhow.

    Should I worry about the seal because it's not seated all around? Or am I OK since it's tight as all heck.

    Any advice would be most appreciated!
     
    Last edited: Jan 30, 2011
  2. mcconnellplumbing

    mcconnellplumbing Scotsman

    Joined:
    Dec 31, 2010
    Occupation:
    plumbing contractor, 25 years, high end residentia
    Location:
    Wellston, OK
    have you made sure the hub is cleaned out all the way to bottom? Any old lead or oakum or rust build up to prevent the seal from seating all the way around? Debris? One can also squeeze the insert into a cee shape, stick it in the hub, then try to expand it back to a circle.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. sfphoenix75

    sfphoenix75 New Member

    Joined:
    Jan 29, 2007
    Occupation:
    Software Sales
    Location:
    Norwood, MA
    The hub is clean as a whistle. All the lead and oakum is gone. Corrosion sanded away with emory cloth and then wiped clean with a wet rag.

    The insert fit nice and snug into the hub without the PVC but when I put the donut into the hub first I couldn't get the PVC in there - even with chamfered edges and lots of lube.

    Best method I found was to put the donut around the PVC and then insert into the hub together. After several attempts, I was only partially successful as described above.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    Not the proper way to insert it. If the cast iron was "really" old, it could have a hub which did not conform to the specifications for a compression joint, which would have made it difficult or impossible to insert the pipe after it was in the joint.
     
  6. sfphoenix75

    sfphoenix75 New Member

    Joined:
    Jan 29, 2007
    Occupation:
    Software Sales
    Location:
    Norwood, MA
    HJ,

    How would you try to insert it?
     
  7. DavidTu

    DavidTu Member

    Joined:
    Dec 3, 2009
    Location:
    Seattle, WA
    You can take precise measurements of both the CI and PVC and call Fernco to see what they have for a best fit. Fernco can make 1000s of different donuts and they will make odd ones on demand.
     
Similar Threads: Fernco Multi-tite
Forum Title Date
Plumbing Forum, Professional & DIY Advice Proper fitting to connect to main...Fernco? Feb 16, 2015
Plumbing Forum, Professional & DIY Advice Tips of the Trade - prepping old Cast for Fernco? Jan 30, 2015
Plumbing Forum, Professional & DIY Advice Connecting PVC to Cast Iron. Fernco likely will not fit... :( Jan 6, 2015
Plumbing Forum, Professional & DIY Advice Fernco fitting question Dec 21, 2014
Plumbing Forum, Professional & DIY Advice temporary fernco on cast iron leaking Nov 24, 2014

Share This Page