Cast Iron to PVC connection - Sewer Line

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by manna, Jan 6, 2011.

  1. manna

    manna New Member

    Joined:
    Jan 6, 2011
    Location:
    Chicago, IL
    Replacing part of horizontal cast iron sewer line that is sagging. A few questions here.

    Is it possible to cut out the sagging Cast Iron section and replace with PVC?

    Is it possible to have the line go Cast Iron to PVC and then back to Cast? Do they make couplings like this?

    Would I be better replacing the bad cast Iron with new cast?

    This section is under concrete slab.
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Chicago might require cast iron, so check that first. Otherwise, underground, you can use a Fernco fitting. This is essentially a thick rubber sleeve with screw clamps at each end. It requires that you torque them properly and backfill and support the line properly, but are approved for use underground. What caused it to sag? Make sure when you replace, you don't end up with the same problem!

    Another possibility if you can remove the pipe from a hub, is to use a Fernco donut. This is inserted, then the PVC is pushed inside. The rubber compression makes the seal. Sizing these for proper fit is critical. This might take care of one end, and the sleeve on the other. Just depends on what you have, and where it is.
     
    Last edited: Jan 6, 2011
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. manna

    manna New Member

    Joined:
    Jan 6, 2011
    Location:
    Chicago, IL
    I'm assuming its a bad connection that just got worse over time with ground settling. Had a camera down there and its about a 10 foot belly, and had it marked. Won't know fully of the cause till its dug up. Hiring a plumber to do all the pipe work, but will be doing the demo myself. Just wanted to know if this something like this was possible, thanks for your reply.
     
Similar Threads: Cast Iron
Forum Title Date
Plumbing Forum, Professional & DIY Advice Old cast iron lead joints has slop new PVC doesn't Saturday at 9:39 AM
Plumbing Forum, Professional & DIY Advice Cast Iron Pipes with Gooey Stalactites Jul 27, 2015
Plumbing Forum, Professional & DIY Advice Is there a fitting - from 4" cast iron to the coupling (fat part) of PVC fitting? Jul 26, 2015
Plumbing Forum, Professional & DIY Advice 4" cast iron drip Jul 20, 2015
Plumbing Forum, Professional & DIY Advice How should PVC drain pipes connect to this cast iron tapped tee? Jun 14, 2015

Share This Page