Fiber Inline Closure, 72 Single Fusion Splice CapacityIncludes one (1) splice tray. Additional FB25 3996STA24 splice trays sold separately. Description Fiber Inline Closure, 72 Splice Capacity Compatible with Splice Tray FB25 3996STA24 The FB23 4384 72IE is a medium capacity fiber optic splice closure designed for a majority of splicing applications in above and below grade installations. The closure supports both aluminum and plastic splice trays and is fully gasketed to prevent the ingress of water