Tub Drain

I had a clogged bathroom tub drain so I poured some Liquid Plumber down it. Now the silver metal flange around the top of the drain has become rusted and is breaking apart. I have no access to the bottom of the tub other than cutting a hole in the ceiling below. Any way of repairing/replacing the flange. Thanks John
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John wrote:

That flange/drain screws into the tub "shoe" which is a brass "elbow" under the tub. The shoe is sealed to the bottom of the tub by a rubber gasket. The flange seals to the top with putty. (Just so you know)
It is *possible* to unscrew the flange part using a tool which fits the cross hairs (or other means). Often, these are in there tight from corrosion and you could wind up ruining it.
To get a replacement you would have to run around and try to match the thread size with what is available today. <ugh>
If you have an access panel at the front of the tub it may be (barely) possible to remove the shoe from underneath. Otherwise you're looking at patching the ceiling.
Jim
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