For this outwardly straightforward process to occur without issues like sewage spills, the main parts of the toilet — including the fill and flush valves, overflow pipe, and gaskets — need to ...

Q: My toilet is causing ... looking spud gasket by pulling it off, and then use either water pump pliers or a spud wrench to remove the locknut (this holds the flush valve in place).

Take a peek inside the toilet tank too, as the mechanisms like the flush valve gasket, float cup, and fill valve could all use repair. Or the bottom of the tank looks excessively dirty.