Chemistry:Flapper valve
From HandWiki
A flapper valve is a type of valve used in flush toilets. It creates the watertight seal in the toilet tank that holds the water until flushing. When one pushes the handle, the flapper rises, allowing the water to flush out the excreted items, the flapper then goes back down and recreates the watertight seal. It working principal is large power to weight ratio.
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