The Corning Closet Connector Housing, CCHCP1215T (Millennium part 570120), terminates 12 fibers of 62.5 m multimode OM1 fiber onto ST-compatible adapters in a metal-cased, composite housing built for rack mount loaded ST panels. Ceramic alignment sleeves keep insertion loss low across repeated patching cycles in legacy multimode inside plant. It's a fit for campus or building backbone runs still running ST connectors rather than newer LC formats. Pair it with matching rack mount ST panels for a complete multimode termination setup.