Malleable iron and aluminium covers for ridge top boxes. NEMA-5-15R Wet Locations. Receptacle Cover has threaded aluminium cap. Plug has neoprene boot and aluminium fastening ring. Furnished with receptacle, neoprene gasket, stainless steel screws. Applicable for Accommodate wiring devices such as switches and receptacles, provide excellent service in areas where boxes are subject to rough usage, serve as pull boxes for conductors, permit access to conductors for maintenance, provide openings for making splices, allow connections for branch conduit runs, FS and FD blank bodies for special conduit-entrance arrangements.