The toilet flange will be sealed to the bottom of the bowl with a wax ring.
Metal ring under toilet rusted.
Pros usually prefer to apply the wax ring this way in order to guarantee a good seal around the toilet.
This way you don t have to get into the walls and replace all the other fittings.
The toilet component can come with a plastic or metal ring that is screwed to the floor and has notches for bolts fitting through the bottom of the toilet and holding it down.
Insert a push in replacement into the flange opening and push down until it is.
Lift the toilet bowl and lay it on its side nearby.
You may be able to remove the old flange by cutting the hub off the pipe and keeping the pipe intact.
You can use the full metal flange ring or you can lag bolt the toilet thru the floor.
Rust stains on a porcelain or enameled cast iron sink toilet bathtub or shower pan are common occurrences.
Tilt up the toilet and push the new wax ring into place.
Press firmly all the way around the wax ring but don t deform it.
Press the rounded side of the wax ring over the pipe stub that surrounds the opening on the bottom of the toilet.
Gently rock it side to side to break this seal.
Carefully lift the tank off the bowl and place out of the immediate area then remove the nuts from the floor bolts with an adjustable wrench.
Pry the metal away from the cut line with a slot screwdriver and pliers until the ring separates from the flange.
Best of all is replacing the flange.
They can be caused when a metal object such as shaving cream can is left to sit wet on the surface but can also be caused by galvanized steel plumbing pipes bleeding rust onto the surfaces or because iron rich hard water dries onto surfaces.
Scrape the old wax ring from the existing flange and then from the bottom of the toilet bowl.