immediately engage with the slot 302 in the flapper arm as it rotates into direct proximity when the flapper is opened water may begin to drain from the tank and as the water level drops it eventually encounters the level of the float when the water level drops below the level of the float 120 the float may lose buoyancy at this point a water weight carried by the upper float reservoir may create negative buoyancy and this disengagement force now downward may cause the second flush detent wedge latch 304 to disengage from the flapper arm the flapper 102 which may be high density may drop closed on the seat shutting off the flow of water referring to fig4 the dual detent toilet flush assembly may be adjustable to provide two distinctly different volumes of water for the first flush and for the second flush thus it should be understood that the volume of water drained from the toilet tank during the first flush and second flush as described herein may be modified such that the amount of water drained during the two flushes can be any volume set by the user by simply altering the starting position of the floats 120 124 along the detent rack in an embodiment the first flush may be a half flush and the second flush may be a full flush each side of the assembly 400 may be an independent system with a separate detent and float the toilet flapper may be latched either at the first flush detent or the second flush detent in an embodiment only one side of the assembly 400 may.