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Replacing my tub.

Below the tub is the PVC drain and it comes with a rubber gasket.

Then the tub-drain unit screws into the drain from inside the tub to make the connection.

I watched a video that said silicone was better than plumbers putty.

I've always used plumbers putty...Is silicone really better than plumbers putty?

I assume the silicone would never go on the PVC drain rubber gasket.

Do I still use Teflon tape on threads if using silicone?

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Neither. The rubber gasket replaces both. Plumber's putty is mostly obsolete these days (almost everything comes with rubber or neoprene washers) and can stain fixtures, and silicone is never a good material for joining water-bearing plumbing components.

You could use PTFE tape as a secondary measure and a thread lubricant. Be sure to wrap it the correct direction.

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I don't use the rubber seal that comes in the box, because it is usually thick and causes standing water.

They sell 2 types of plumber's putty: regular and a non-staining one. Old-school putty has been around for long time for a reason. It will dry out at some point; but rubber swells over time, so pick your poison.

  • You're using the gasket incorrectly. It belongs under the sink. Sometimes there's a second very thin one which would go on top, but that's going to compress to almost nothing. – isherwood Nov 7 '19 at 15:50

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