Abstract: A sink divider is detachably attachable across a sink to form a first and second compartment of the sink. The sink divider has an expandable bladder that is pressurized by a pressurization apparatus to press the bladder against the wall of the sink to create the two compartments. The pressurization apparatus includes a plunger that plunges fluid from a pressure receptacle into the bladder. A pressure valve may be fluidly coupled with the interior of the bladder to release fluid when the pressure in the bladder exceeds a threshold pressure. The sink divider may also have a pair of retainer arms that are spring deployed to press a retainer stop against the wall of the sink to further stabilize and support the sink divider within the sink.