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    Paul8888's Avatar
    Paul8888 Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Jun 13, 2016, 10:51 AM
    Replacing threaded cast iron cleanout plug with a plastic one
    A threaded 3 inch cast iron cleanout plug in my toilet sewer line has deteriorated. I bought a plastic threaded replacement plug for it.

    Can I just screw it in as is, or do I need to use something like Teflon tape or another type of sealant on the threads to prevent future leakage?

    Thank you for your help.
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #2

    Jun 13, 2016, 11:03 AM
    Yes, you can screw it in as is. However, I suggest you put teflon tape over the threads. That way you make sure no sewer gases will be escaping into your bathroom


    Hope that helps

    Milo
    massplumber2008's Avatar
    massplumber2008 Posts: 12,832, Reputation: 1212
    Senior Plumbing Expert
    		  
    #3

    Jun 15, 2016, 01:59 PM
    You can use Teflon tape or plumber's grease... both work fine.

    However, a 3" cast iron plug is usually not the same size as a 3" PVC plug, so be prepared, and if that is indeed your case in the end, you can purchase a 3" LEAD FIT ALL plug at a local plumbing supply store. Here, you grease the threads of the lead fit all plug and you use a hammer to tap the plug into the threads of the cleanout while you spin the plug... effectively cutting new, deeper threads into the lead plug.

    Good luck.

    Mark
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