Water tanks can have an opening to a bowl {toilet}| {water closet}. When rubber stopper moves, water falls into bowl. Bowl water goes out drain. A U-shaped pipe in drain {toilet trap} holds water, to prevent odors from coming from sewer pipes. Rubber plug falls back into hole. A float-control ball opens a valve to let water into tank, until float rises enough to close valve.
Flushing can cause vacuum {vacuum breaker}|, which sucks bowl contents out. Water flowing back in causes new vacuum.
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Date Modified: 2022.0225