Make sure they have seals to block water and dust. Plastic works indoors, but metal is stronger and resists rust outdoors. These show how well the enclosure keeps out water and. LC LICTOP offers a waterproof junction solution designed for FTTH lead-ins and drop cables. The enclosure protects the two optical fiber lines from junction stress and. The box body is made of reinforced plastic, high strength, resistance, sealed and APPLICATION:Flame retardant and waterproof,prevent vibration,shock,cable stretching,twisting,etc. They shield 72 fragile optical fibers from harsh elements. Internal trays organize 4 cable ends for safe routing. | Fiber Box Enclosure for MPOE's, Network Rooms, and IDF Rooms.