Vertical type fiber optic splice closure. Hoop is used to fix and seal FOSC cover and base, and its installation is quite simple. Closure is provided with 7 fiber cable inlet/outlet tubes. After being heated, heat shrinkable fixing sleeve is used to fix and seal between inlet/outlet tube and fiber cable. The FOSC is suitable for protecting fiber cable splices in straight-through and branching applications. It can be placed in aerial, underground, wall-mounting and wall-mounting in handhole and duct applications. Based on an advanced formula, the plastic parts are made of injection-molded, high-strength engineering plastic PC by numerical control equipment, therefore effectively prevent products from aging caused by coldness, heat, oxygen and ultraviolet radiation. The strong housing and main components provide fire resistant, waterproof, and quakeproof while protecting splices during pulling, torsioning and impacting. It ensures long-term reliability and usage under ambient temperature from –40oC to +65oC.