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A press cistern control has a mechanism used in toilets, particularly in modern flush systems, to regulate the release of water from the cistern (tank) into the toilet bowl. It is commonly found in dual-flush systems, which allow users to choose between a full flush and a partial flush, depending on the waste being disposed of. The press cistern control is typically a button or a pair of buttons on the top of the cistern that the user presses to activate the flush.