The idea of stacking wax rings has been around for a while but it is not recommended by leading manufacturers. Some of the new waxless style toilet seals have a longer seal or can be stacked which can make it easy for anyone to set a toilet without leaks. Take a look at some of the toilet seal choices you can pick from when replacing a toilet. If you have a normal height closet flange then you can use the regular wax ring with a sleeve. If your flange is floor level or slightly below then you can use an extra-thick wax ring. If the flange is lower than a 1/4” below the floor level then you should use a flange extension to raise the flange height or remove and replace the old floor flange and set it to the right height. The o-ring not only prevents water from coming back but also sewer gas smells from coming back up into the bathroom. This type of waxless bowl gasket can be reused or reset multiple times. Fluidmaster makes one such waxless ring that can adapt to 3” or 4” drains. If more height is required the foam gaskets can easily be stacked. Unlike most other types of seals, foam gasket seals maintain a good seal even if the toilet rocks. This type of gasket will allow you to set the toilet multiple times, unlike wax rings that get smashed once and need to be replaced.
