SS-1in2out-M3S-HDB Dome Fiber Optic Splice Closure is a type of dome closure series, used for direct connection during optical fiber transmission process, and provides joint connection protection. This Vertical closure can be used in pole mounting, wall-mounting and underground applications. There are 3 circular cable ports and 1 oval port; the oval port can be used for cable loop through. It supports to equip a slot for 1:8 splitter. The outer box body is made of high-strength engineering plastics, It has features of light weight, high mechanical strength, anti-aging, strong corrosion resistance, lightning resistance, and long service.