The 17-300390 is a robust, nickel-plated die-cast duplex LC multi-mode receptacle and cover assembly. It features a secure bayonet locking mechanism and is constructed with a zinc die-cast housing for durability in harsh conditions. The internal multi-mode adapter utilizes phosphor bronze alignment sleeves and is housed in a beige, UL94 V-0 rated PPO material. This connector assembly is IP67 rated when covered or fully mated, ensuring protection against dust and water ingress. It operates reliably across a temperature range of -40°C to +85°C and can be front or rear mounted on panels up to 3.2mm thick, making it ideal for industrial fiber optic applications.