Dust Caps protect the mating surfaces of the connector from physical damage and seal the connector against particle and moisture contamination. All Dust Caps consist basically of a cylindrical body closed at one end. Dust Caps for receptacles have either a gasket or ‘O’ ring for sealing.

An optional component is an attachment method which assures that when the Dust Cap is not in use, it remains in the immediate area of the connector. While the Military has provisions for only two attachment configurations (sash chain or wire rope), various manufacturers offer several additional types (beaded chain, nylon rope, etc.) and a variety of finishes.