Leaky closet spud gasket: the rubber gasket sealing the toilet tank to the bowl may be leaky, or fittings securing the tank to the bowl could be leaking. Watch out: If leaks are at the toilet tank mounting bolts you will might see water on the floor. But then again you might not. [...
Toilet Flapper The flapper is found in your toilet cistern. It opens to let water flow into your toilet bowl, then seals it off when the flush has finished.