Pressing both buttons simultaneously on a dual-flush toilet mechanism typically triggers a full flush, releasing the entire volume of water stored in the tank (usually 1.6 gallons). Dual-flush systems are engineered with a split push-button panel where the smaller button activates a partial flush for liquid waste (around 0.8 to 1.1 gallons) and the larger button engages a full flush for solid waste. Pressing both buttons overrides the split mechanism, dropping both internal valves to execute a complete flush.
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