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Opening wye plug in older cast iron sewer pipe

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  • Opening wye plug in older cast iron sewer pipe

    My basement cast iron 5"? sewer line is probably more than 50 years old. In a 2-foot section, there is a wye of about 2" I.D. with a threaded plus with a square boss. I want to install a washing machine/utility sink drain line into this wye. Can I just unscrew the plug and find an adapter for a 2" copper drain pipe? Is there a danger in trying to unscrew something that old? How can I minimize the danger of breaking something? Thanks.

  • #2
    Re: Opening wye plug in older cast iron sewer pipe

    sometimes tightening first will break it loose. sometimes heat the plug a little bit. other times i use a hole saw to drill it out and pry out the remaining thread.

    don't use brute force as something will give and it's usually not the plug

    bigger problem is the drain for your laundry will still need to be vented.

    rick.
    phoebe it is

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