RV Designer B101, Round Electrical Cable Hatch, Universal, 5 inch Diameter, Polar White RV Designer Universal Round Electric Cable Hatch Includes two interchangeable rear buckets One fits 3 inch hole, one fits 3-1/2 inch 3 inch bucket accepts 30 Amp cord and plug; 3-1/2 inch accepts 30 or 50 Amp Unique design diverts water