The Whirlpool WPW10450959 is a washer water level switch, which is an important component for controlling how much water your washer uses throughout each cycle. This switch, which is inside the washing cabinet, keeps an eye on the water level when the bathtub is filled. Consider a sensor that talks to the control panel of the washing machine. The switch senses the rising water pressure in the tub and stops the washer from filling when the appropriate level is achieved. This guarantees effective water use and stops overflows. A malfunctioning water level switch might make the washing run too little water, which results in poor cleaning, or too much water, which causes overflows and water waste.