The Vertical Hermetic Fiber Optic Splicing Closure is a complete set of accesorries used for connecting permanently two (or more) micro cables or fiber optic cables. After being heated, a heat shrinkable fixing sleeve is used to fix and seal the inlet/outlet tube and fiber cable. A closure is installed in a vertical position. Its strong housing and the main components make the closure fire resistant, waterproof and quakeproof, and protect the fibre-optic fusion splices against pulling, torsion and impact. It can be deployed in aerial, underground, wall-mounting, hand hole-mounting and duct-mounting applications. FOSC DJS-25III equipment with FOST D24III splice trays allows to install 6 splitters in ABS housings.