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Thread: Sewer transition, backflow & cleanout

  1. #1
    DIY Junior Member rockosani's Avatar
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    May 2005
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    Chewelah, WA... 1 traffic light!
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    Default Sewer transition, backflow & cleanout

    I have a 4" cast sewer line and want to add a cleanout & backflow just outside where the line exits the house... about 3' underground. Can I remove a section and use PVC and, if so, what is the proper connector for the transition... a stainless steel clamp? I could never understand why a cleanout would be placed in the basement so that you would have to drain it there to get a snake into the line. My other thought was to put a riser in the basement and a 90 at the top to extend it outside, and forget the backflow, above the ground level... basement sill is about 2' above ground level. Any recommendations?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Default sewer

    Install the cleanout outside and forget about the backflow valve.

  3. #3
    DIY Junior Member rockosani's Avatar
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    Default

    Great... what's the proper transition piece to connect a PVC riser and cleanout to the older cast pipe?

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default connection

    In most areas a Mission/Fernco coupling

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