This part is the replacement manifold for your dishwasher. It is made of gray plastic and is approximately 13 inches long and 3 inches wide. The manifold protrudes from the tub wall and connects to the middle spray arm. If the manifold is damaged, the spray arm will not be able to wash the dishes in the dishwasher evenly. If you notice that your dishwasher is not cleaning the way it should, it is an indication that you should check the manifold for damage. This part is an authentic OEM part sourced directly from the manufacturer and it is sold individually.