Culwell A43 Floor Protecting Toilet Flange, 4" x 3"

I was looking for a waterproof flange that wouldn't allow water to leak through my floor and onto the ceiling downstairs (like my old one did!). I used silicone under the flange and RedGard around it and on the floor in the room. I feel very confident that when the wax ring gives out next time (it will...it always does) it won't leak through the floor.

works as advertised