Hubbell HBL303SS 30A Round Stainless Steel Inlet. Traditional, stainless steel shore power inlet has new easy-to-wire terminations. Interior is transparent for quick and easy visual inspection. Interior is shielded from the elements by a gasketed, self-closing cover, watertight when cover is screwed in place. Mounting holes are 23/8" (60.3) on centers. Mounting screws and gasket included. Protective rear enclosure/strain relief also included.