Abstract: Dust caps for cable connectors are provided. The dust caps include an internal reservoir containing a quantity of desiccant held captive by an air permeable stopper. The desiccant can be a color-indicating type, and can include a gas absorbing material. The dust cap can be threaded to mate with cable connectors and can be configured to connect to male or female threaded connectors. A gasket can be included to provide a substantially airtight seal when the dust cap is installed on a connector. The dust cap can be constructed of a transparent material to allow for visual inspection of the desiccant.