This is a genuine Whirlpool replacement part. This control knob is commonly used on trash compactors. Most often this knob attaches to the rotary switch allowing you to control the trash compactor. This switch determines whether the trash compactor is on or off. If your control knob is lost or damaged this is the replacement knob you need. Replacing the knob is simple, you just firmly press the knob into place on the rotary switch. This knob is made of plastic, and it is sold individually.