Wax Ring
A wax ring is the soft sealing gasket that sits between a toilet base and the floor flange, blocking water and sewer gas from escaping at the connection.
A wax ring is exactly what it sounds like: a doughnut of sticky wax, sometimes with a plastic funnel molded into the center, that compresses when a toilet is set down onto the flange in the floor. That squashed wax forms the seal that keeps flush water and sewer gas from leaking out around the base. It is one of the least expensive parts in the bathroom and one of the most important, because everything the toilet sends down passes right through it.
Homeowners meet the wax ring when a toilet starts leaking at the base, gives off a sewer smell, or rocks on the floor. A ring fails when the toilet shifts, when it was set unevenly, or simply from age as the wax hardens and stops sealing. The fix is to pull the toilet, scrape off the old wax, and set a fresh ring; the wax cannot be reused once it has been compressed and broken loose.
There are waxless alternatives now, rubber or foam gaskets that some plumbers prefer because they can be repositioned and do not melt in a hot attic, but the traditional wax ring is still the default. The one rule that trips people up is height: if the flange sits below the finished floor, a standard ring may not reach, and a taller ring or an extender is needed for a clean seal.
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