Fernco Multi-tite donut won't seat 100%

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

  1. sfphoenix75

    sfphoenix75 New Member

    Messages:
    26
    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

    Messages:
    43
    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. sfphoenix75

    sfphoenix75 New Member

    Messages:
    26
    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.
  4. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,614
    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.
  5. sfphoenix75

    sfphoenix75 New Member

    Messages:
    26
    Location:
    Norwood, MA
    HJ,

    How would you try to insert it?
  6. DavidTu

    DavidTu Member

    Messages:
    239
    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, Tips & Buried Fernco/Mission coupling - use metal banded or all rubber? Aug 15, 2014
Plumbing Forum, Professional & DIY Advice, Tips & PVS Repair Coupling VS. Fernco Coupling Apr 20, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Fernco Donut Tight-ness question (maybe too loose?) Mar 12, 2014
Plumbing Forum, Professional & DIY Advice, Tips & Fernco couping question Jun 2, 2013
Plumbing Forum, Professional & DIY Advice, Tips & slow set pvc cement or glue for slip fitting vs. fernco or no hubs Jan 10, 2013

Share This Page