Fernco Donut Tight-ness question (maybe too loose?)

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by thenextdon13, Mar 12, 2014.

  1. thenextdon13

    thenextdon13 New Member

    Messages:
    14
    Location:
    Oregon
    Hello-
    I've read a lot here about people having trouble installing the donuts because of tightness. I'm a little concerned about the one I installed over loosness;

    questions are--
    1. how loose can the donut be in the hub before the pipe is inserted?
    2. how easy should it be to insert the ABS pipe?
    3. how much should I worry about corrosion pitting in the hub from the previous (poor) lead job?

    for #1 -- I could insert the donut into the hub, and remove it relatively easily. The ribs of the donut caught a little bit on the outer rim of the hub, but not enough to make it hard or damage it on removal. When the pipe was pushed in, the outer lip of the donut wanted to roll into the gap, but did not (see picture) Is this ok?
    Pipe_In_Donut_In_Hub_Fittment.jpg


    For #2 -- I soaped it up and worked it in relatively easily. Two hands and twisting but over my head as well.

    For #3 -- I cleaned out the hub with a wire brush first, then sanded with emery cloth. I would not be able to get rid of all pitting. Attached are a few pictures to show state. Does this look ok?
    Pitting_Inside_Hub_1.jpg Pitting_Inside_Hub_2.jpg


    I'd like to have some input before I continue with ABS-- would like to avoid having to re-do this. I am aware fernco makes custom sizes if one is needed.
    Any input appreciated!
  2. Terry

    Terry Administrator Staff Member

    Messages:
    15,005
    Location:
    Bothell, Washington
    That looks like a good fit there.

    The rubber Fernco is a bit loose until you push the pipe in. Then it should be snug.
  3. thenextdon13

    thenextdon13 New Member

    Messages:
    14
    Location:
    Oregon
    Thank you very much, Terry.
  4. Reach4

    Reach4 Active Member

    Messages:
    2,239
    Location:
    IL
Similar Threads: Fernco Donut
Forum Title Date
Plumbing Forum, Professional & DIY Advice, Tips & Fernco Multi-tite donut won't seat 100% Jan 30, 2011
Plumbing Forum, Professional & DIY Advice, Tips & Fernco Donut Sep 9, 2006
Plumbing Forum, Professional & DIY Advice, Tips & Fernco donut or similar product for 4" XH cast iron hub Jul 20, 2006
Plumbing Forum, Professional & DIY Advice, Tips & Leak between CI hub and Fernco donut... May 14, 2006
Plumbing Forum, Professional & DIY Advice, Tips & Buried Fernco/Mission coupling - use metal banded or all rubber? Aug 15, 2014

Share This Page