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