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Finding an Airtight Stopper for Bathtub Overflow Drain

I have a bathtub in my basement that is directly underneath my kitchen. The kitchen and bathtub drainpipes must connect underneath the basement floor, and the bathtub drain regularly (every six months) starts backing up with waste water from the kitchen.


I'm installing a sealable stopper on the bathtub drain to prevent backups through the drain, but the tub overflow remains open. Is there a seal/stopper I can buy to prevent air/water from backflowing up the overflow tube when the tub isn't in use? I'm currently the only person using this bathtub/shower, so I'm not worried about safety issues and can disable/remove it if this changes. Thanks!

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November 6, 20190 found this helpful

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November 7, 20190 found this helpful

There are many different kinds you can buy for your tub. Here are some that Amazon sells -


What you should do is go to a plumbing shop in your area with an image of the hole you want to close up and seal. I would also take a photo of this and if you can measure it this would be even better. They are experts and have all the materials needed to do your job. Other than this you can take your chances and order online.

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Consumer Advice Product FinderNovember 6, 2019
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