This manifold docking station and flapper (part number DD94-01008A) is for dishwashers.

Manifold docking station and flapper DD94-01008A connects the upper spray arm manifold to the water feed tube assembly. The docking station has two ports to allow for different rack heights, and comes with the flapper that prevents water from leaking from the unused port.

Unplug the dishwasher and shut off the water supply before installing this part. Wear work gloves to protect your hands.