The 66‑12LC is a closure plate designed for use with the B‑Line series lay‑in wireway system sized at 6 inches high by 6 inches wide. It is fabricated from steel with a phosphate undercoat and a polyester powder‑coated finish in ANSI 61 gray. The component is rated for NEMA 12/IP54 environments, providing protection in indoor industrial settings against dust, dirt and light moisture. It measures approximately 11.5 inches in length by 6 inches width by 6 inches height and includes sealing plate kits to maintain the integrity of the enclosure when the run of wireway ends. This product is suited for commercial or industrial installations where a clean, sealed termination of a wireway run is required.