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See our huge collections of dual flush toilet buttons. Nowadays, dual flush toilet button comes with two different type of buttons: small and large. Small flush button use less water around 3 to 4.5 litres to flush out the toilet waste whereas large flush button use large amount of water around 6 to 9 litres to flush. Each buttons is connected to its own exit valve. In short, small button is use to flush out liquid waste and large button is use to flush out solid waste.