Chlorine bleach cleansers will not affect this toilet gasket.
The toilet gasket fits any drain size such as 3 inches or 4 inches in diameter standard drain pipes.
This toilet gasket has the best of both worlds, it lasts much longer than wax seals, also can be re-positioned many times without losing its shape, allowing movement without leaking, and it is great for high and low temperatures, not like wax seals that are messy, and you have only one chance to place them. Also, it is flexible and sticky, completely different than the Fluidmaster or similar units. The high adhesion ensures a tight seal. It is also anti- microbial, prevents bacteria growth.
This will not replace your cracked cast iron pipe flange, but you will also need a new toilet gasket in order to secure the flange to the toilet. With this Wax-less elastic gasket, you can reposition it and re-use it
The elastic wax-less gasket can be used on the same flange height scenarios than a standard wax ring, but with many additional benefits. The elastic wax-less gasket can be used perfectly well with flanges over the floor level (usually 1/4 to 3/8” that is the thickness of the flange) or if the flange is at the same level as the finished floor. The thickness of the elastic wax-less gasket is about 13/16”.