In-line optic splice closure is specially designed to splice and protect fiber joints of all type of optic cable with dimension ≤12mm . It is mainly used to connect and branch optic cables in overhead, pipeline or manhole applications. Adopt high-intensity engineering plastics and formed by plastic injection mold under high pressures. Adding anti-UV, corrosive-resistance, aging-resistance elements, to be with long durability. Reopenable mechanical sealing system, simple and reasonable inner structure, easy installation, is a reliable option for communication network construction.