Q. How do toilet bowls work?

Answer

As its name implies the filler valve (or refill valve) can be used to direct water in either of two directions. The refill tube receives some water and the tank begins to fill up again. Overflowing contents are sent into the bowl via the overflow tube and the bowl refill tube. That's a slow way to fill up the dish again. So long as we pour in enough water to trigger the siphon the toilet will flush. The tank and flush valve work together to rapidly release around 2 gallons (7.6 L) of water into the basin. The water can be turned on and off at the refill mechanism's valve. When the filler float (also known as a ball float) drops water flows through the valve.