MPO connector transparent dust cap is designed for MPO ferrule with high grade protection visually. Snap-lock design effectively prevents sealing failure caused by vibration and thermal deformation. 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. L-com offers an extensive line of protective dust caps for popular styles of fiber optic connectors.