These universal caps protect fiber connectors from contaminates and damage that can cause serious network slow downs or crashes. Whenever a fiber cable is not plugged in, it should always have a dust cap protecting each connector. By simply covering your fiber connector end faces, network uptime and performance can be greatly improved.
It is made by elastomer resin, used for dust proof and protection of ferrule and cable. Also there are different color to identify the wiring of optical fiber.