For example, dual-flush toilets usually come with two ... channels some water down the overflow pipe and into the toilet bowl. The fill valve activates automatically after each flush and ...

A toilet flush valve controls the flow of water from the tank into the toilet bowl. It is made of a valve body, a flapper, ...

And even in their liquid-waste setting, dual-flush toilets save little water over a capable, single-flush toilet—and can use far more if they require a second flush to completely clear the bowl.