The heating element nut is used to connect the heating element to the dishwasher tub. If water is leaking from underneath your dishwasher, you may need to tighten or replace the heating element nut. Replacing the nut is an easy job, does not require any specialty tools, and should not take you more than 10 minutes. For our step by step guide, click the video below. The brass nut measures 7 inches in length x 1 inch in width x 5 inches in height, and fits most dishwashers.