Abstract: A new and unique connector adapter shutter door assembly retrofitable to many existing connector adapters or receptacles which becomes a part of the same by connectedly fitting or snapping into place. The shutter door assembly can be used as a safety device to prevent laser light from escaping when a connector is removed from an adapter or receptacle. Because of the ease with which the shutter door assembly can be retrofitted to existing adapters, it is possible to selectively install the shutter door assembly only when a safety hazard is present. Also the shutter door assembly can be used to shield a connector end to prevent foreign matter, such as dust and dirt, from entering the connector. The shutter door assembly is a molded one-piece structure and has inwardly hinged doors permitting one hand connector insertion and withdrawal. The streamline design of the shutter door assembly takes very little space when in use making it desirable for typical space constrained applications.