A fiber optic adapter, sometimes also called a coupler, is a small device designed to terminate or link the fiber optic cables or fiber optic connectors between two fiber optic lines. By linking two connectors precisely, fiber optic adapters allow the light sources to be transmitted at most and lower the loss as much as possible. At the same time, fiber optic adapters have the merits of low insertion loss, good interchangeability and reproducibility. This SC Simplex Adapter allows you to patch together SC connectors or SC fiber patch cables quickly. The SC coupler is particularly suitable to connect two single fiber SCs for a fast, precisely, quality field connection. The SC adapters feature zirconia ceramic alignment sleeves which provide precision mating for singlemode applications. 6PCS SC to SC Simplex Singlemode Plastic Fiber Adapter SC to SC Simplex OS2 Single Mode Fiber Optic Adapter/Coupler with Flange - Green