Re: Proper way to seal a toilet flange extender/spacer
Putty? I would never use this method. Sounds to me like someone ran out wax rings and decided to use what they had. Putty will dry and crack. We run across a lot of white spacers that plumbers try to seal with silicone down on top of the flange. They leak after about 3 years. Big mess. I recommend raising the flange to above the floor and screwing it down with corrosion resistant screws. Those holes in around the ring are not there for looks. As for the spacers, I don't see a good way to attach them to flange.
Oatey is kind of vague on the installation of spacers. They don't say how to attach it to existing flange:
DIRECTIONS FOR USE
Stack rings (maximum of 3) onto existing closet flange ring to accommodate desired height. Rings can be solvent welded together on the horizontal surface using PVC solvent cement or can be secured using mechanical means.
"don't put that in your mouth, you don't know where it's been"