Fix Bathroom sink drain leaking at rubber gasket, proper installation instructions stop the leak. Do this when installing the drain, the result will be a leak free replacement. Moen instructions don't tell you to do this.

There is a gap between the threads of a bathroom sink drain and the rubber gasket. The pros know that the threads have to be sealed with Teflon tape or a sealant. Currently, Moen's installation instructions to not mention to do this step. The result is a drain that leaks at the threads and rubber gasket.

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