Fiber Patch and Splice Panel, High Density, Slide-Out, 4U, 12 Adapter Panel CapacityAdapter panels and splice trays NOT included This fiber patch panel is only compatible with our FB24 adapter panel inserts and our FB25 3401STP36 Splice Trays. To find out more, give us a call or email us. Description Fiber Patch and Splice Panel, High Density, Slide Out, 4RU, Holds 12 Adapter Panels and 8 Splice Trays, Up to 288 Splices, Black This 4U fiber distribution unit provides high density fiber capacity of up to 288 fibers when utilizing 12