The TayMac CP4100S is a heavy-duty metal closure plug designed to seal unused 1-inch NPT openings in weatherproof boxes, extension adapters, and round splice boxes. Its durable die-cast construction and powder-coat finish provide excellent resistance to weather and scratching, making it ideal for outdoor electrical enclosures. With a gray finish and compact threads, it easily screws into place to help maintain the enclosure’s integrity and safety. Rated for use with outdoor weather-proof systems, it helps prevent moisture ingress and meets typical electrical code sealing requirements. This bagged 4-pack ensures you have multiple plugs on hand for maintenance or new installations.