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Thread: Cast Iron to PVC connection - Sewer Line

  1. #1
    DIY Junior Member manna's Avatar
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    Default Cast Iron to PVC connection - Sewer Line

    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. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    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 by jadnashua; 01-06-2011 at 12:55 PM.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member manna's Avatar
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    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.

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