This is the horn of the toilet. When the toilet is turned upside down it will look like this. When the toilet is installed, the hole of the toilet flange should be aligned with this horn.
When you are installing a toilet onto a vinyl floor the horn of the toilet will fit into the hole of the flange.
This is a piece of tile placed across the base of the upside down toilet. The edge of the tile is touching the bottom edge of the toilet and also the bottom of the toilet flange. This shows that when the toilet flange is adhered to the floor the toilet can esily fit over the flange.
To make a sanitary seal every toilet flange needs the use of a gasket. No toilet flange would pass code without one. The picture shows a wax ring that will be used as this gasket. The Watertight Toilet Flange is different from all other flanges in that the engineering protects the sub floor from water. To make this new flange provide protection from trace amounts of sewer air seeping an additional gasket needs to be placed onto the flange before the toilet is installed. Pictured is a silcone caulk.
Before the toilet is installed place a bead of caulk on the perimeter of the flange. For vinyl floors a 1/4 inch high bead of caulk will work. For 1/4 and 3/8 inch thick tile applications more caulk may be needed.
When the flange is placed onto the horn of the toilet the caulk makes a perfect seal. This means that when you install your toilet a perfect seam is created with the permeter of the flange and the toilet.
Water can get under your toilet from and damage your your sub floor and also damage the bolts used to to connect the toilet to the flange making it difficult to remove the toilet. We recommend that after the toilet is installed you place a bead of of silicone on the floor edge around the perimeter of the toilet and fill the holes used for the bolts so no moisture can get under the toilet. This will also keep any sewer gas from escaping if the wax ring leaks. Place the bolt caps over the bolt heads and you are done.