Dishwasher Overfill Standpipe Nut. This overfill standpipe nut (part number WP9741998) is for dishwashers.Overfill standpipe nut WP9741998 attaches the dishwasher float to the overfill standpipe.Unplug the dishwasher and shut off the water supply before installing this part. Wear work... - Dishwasher Overfill Standpipe Nut.