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Thread: Tee into existing stack-retrofit

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  1. #1
    DIY Junior Member scdean's Avatar
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    Default Tee into existing stack-retrofit

    Hi all. I need to tee a dry vent into an existing 3" vent stack just below the attic but there are fittings above and below where I need to tee in so i can't separate the pipe to fit the tee in. I found something on a UK site called a strap-on boss but I've never seen anything like that here; basically just drill into the pipe and strap the tee on.
    Since there's no waste in this tee, is there something available/allowed here?
    Thanks,

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Saddles are not allowed anywhere in DWV system, although they will work. However, something from the U.K. will probably have the wrong radius for your pipe.
    Licensed residential and commercial plumber

  3. #3
    DIY Junior Member scdean's Avatar
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    I figured as much. Thanks for confirming. Looks like I've got a lot of piping to redo
    Cheers

  4. #4

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    Can you post a few pics of your situation?

  5. #5
    Test, Don't Guess! cacher_chick's Avatar
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    In some cases it would be easier to take it across the attic to a different spot and run the new vent through the roof by itself.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Or tie into one of the existing vents, other than the main one.
    Licensed residential and commercial plumber

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