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110mm boss into soil stack

Discussion in 'Plumbing and Central Heating' started by Inchiquin, 3 Apr 2021.

  1. Inchiquin

    Inchiquin

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    Will a 40-110mm boss fit snugly into an old cast iron soil stack junction (presumably 4")? If it's too small that shouldn't be a problem as I can seal it, but if it's too big I'd rather not find out after I've dismantled the existing waste system.

    Alan
     
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  3. CBW

    CBW

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    If you’re thinking of a strap boss, how do you expect to drill it?
     
  4. Hugh Jaleak

    Hugh Jaleak

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    Assuming I have read this right, then a 110mm plastic spigot into a 4" CI socket should be ok.
     
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  5. Emit

    Emit

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  6. Emit

    Emit

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    Can also use a very decent hole saw as well
     
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  8. Inchiquin

    Inchiquin

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    Sorry if I was unclear. I thought that "into a stack junction" would make it clear enough that there is already a junction into the stack so no drilling required. I want to replace an old lead bath outlet with 40mm plastic. Currently it's sealed into a 4" junction to the stack (presumably with lead). Since 110mm is slightly bigger than 4" I wanted to be sure that a 40-110 boss was likely to fit before I disable the existing pipe.
     
  9. CBW

    CBW

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    Yes clear as mud o_O I think I know what you mean now though, probably best with Hugh’s advice, or an adapter of sorts.
     
  10. Hugh Jaleak

    Hugh Jaleak

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    Might save yourself a whole world of pain if you cut the lead off as close to the stack as you can, but leaving enough of a stub to get a compression waste coupling onto, then going from there in plastic. Depends how neat you want it to look, and if you've asbestos hands I think.
     
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  11. Nige F

    Nige F

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    As Hugh says = a Mac Alpine compression fitting is the universal fitting one - lead/plastic 40mm
     
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