US Patent 7827627 Dual-detent retrofitable toilet flush assembly

The present invention provides a two-level flush assembly that can be retrofitted to virtually any toilet with a tank that provides two different water volumes for toilet flushing with a full tank flush for heavy waste and a partial tank flush for light or liquid waste. The flush assembly may use the existing handle and provide tactile feedback for each of the two flush volumes. The two levels of flushing action may be achieved with two independent detent-latch mechanisms, one on each side of the tower, operating on the single toilet flapper. Two independent floats may be utilized, each connected to a release mechanism on either side of the flapper and the water level that supports the float may determine when the flapper is released to close on its seat. The two floats may be set at two different water depths providing a flushing action releasing different volumes of water.