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Thread: How do I replace a cast iron flange?

  1. #1
    DIY Junior Member dy's Avatar
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    Default How do I replace a cast iron flange?

    How do I replace a cast iron flange? It is welded on I think. I removed the screws and it of course didnt come off. I have a new PVC one, but not sure how to get this flange off. The bolts are corroded and old and just keep spinning, so I need to replace it.

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    Moderator & Master Plumber hj's Avatar
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    You have a plumber break the old one off and install a new CAST IRON one. The PVC one will NOT WORK. But if the bolts are spinning, you need new bolts, NOT a new flange.

  3. #3
    DIY Junior Member dy's Avatar
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    I got new bolts, and they keep spinning too. I dont think they are the right size , or do they have different sizes? they were the standard ones that come in with the wax ring.

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    Forum Admin, Expert Plumber Terry's Avatar
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    I normally use a washer and nut to secure the closet bolt to the flange.
    The hardware stores make you buy two sets, or look in the isle for more 1/4 20 nuts and washers.

    We sell our customers the bags with four nuts and washers.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Normally they do not spin because they have "oval" heads which fit into a recess on the bottom of the flange, but most of us secure the bolts to the flange with a nut and washer. It makes it easier to remove the next time, because the bolt CANNOT spin.

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