Fiber Splice Shelf, Slide-Out, 4UIncludes one (1) FB25 4000STP24 splice tray. Remaining splice trays are sold separately. Comparable to Corning's CSH 03U This fiber patch panel is only compatible with either our FB25 4000STP24 splice tray or FB25 3401STP36, which are sold separately. To find out more, give us a call or email us. Description Fiber Patch Panel, Slide Out Splice Shelf, 4RU, Holds 8 Splice Trays The FB23 3928RSS8 is a 4 Rack Unit (4RU) in rack splice shelf designed to