HBL503SS. Traditional stainless steel shore power inlet has gasketed, self-closing cover so interior is shielded from the elements when not in use. Watertight when cover is securely fastened. Mounting holes are 23/8" (60.3) on centers, and rear portion has 2.171" (55.1) diameter. Mounting screws and gasket included. IP56 SUITABILITY.