To connect two fiber optic cables each with different connector ends, you’ll need a coupler. The CPLR-SCST-FD is a handy way to do this. It connects duplex SC to duplex ST fiber to extend the fiber optic cable run. This coupler is built from high-quality lightweight plastic for reliability and long life. It supports a duplex fiber connection and features alignment sleeves to ensure signal integrity. Dust caps are included to keep out contaminants and particles when not in use.