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