Fiber optic adapters join separated connectors. They are assembled in panels and allow connecting pigtails with patchcords. For every type of connector there is equivalent type of adapter.Generally there are 2 types of alignment sleeve within an adapter-phosphor bronze for multimode and ceramic for singlemode. the adapter is purely to support and lock the connectors together in the distribution box.
26F, 2# Building, Global Finance Center, Yangzhou city, Jiangsu, China.