Includes two interchangeable rear buckets. One fits 3 in. hole, one fits 3-1/2 in.. 3 in. bucket accepts 30A cord and plug 3-1/2 in. accepts 30A or 50A. Unique design diverts water. Gasket and screws included, plus everything you need for easy installation. 5-1/8 in. diameter faceplate covers holes and marks from most other hatches. UV protected plastic.