be placed about ferrule 202 and the polished end face of the optical fiber to protect the polished end face from contamination from dust fingerprints or other items which might degrade optical signal transmission while it is known to store these in known optical fiber adapters until the fiber within the attached cable is needed to connect to another fiber optic cable to optical signal equipment such storage is less than ideal as adapters do not seal the polished end face from contamination as well as dust cap 204 securely fit and held about ferrule 202 of connector 200 known adapters do not permit insertion of connector 200 which still has dust cap 204 in place about ferrule 202 and the polished end face of the cable referring now to fig1 and 16 connector holder 110 includes a main housing 112 defining an interior cavity 114 an open end 118 permits insertion of a connector 200 into cavity 114 while an opposite opening 116 permits dust cap 204 to protrude from connector holder 10 a clip 120 is positioned about main housing 112 and includes a pair of spring mounting clips 122 a pair of flanges 124 extends from opposing sides 126 of main housing 112 adjacent spring clips 122 clips 122 and flanges 124 cooperate to releasably mount holder 10 to an opening in a bulkhead as is shown below main housing 112 also includes a bottom 130 with a keyway 128 to receive a keyed extension of connector 200 to consistently orient connector 200 for insertion into cavity 114 opposite bottom 130 is an open top closed by a cover 132 this is shown in more detail in fig2 below fig1 through 21 provide additional views of connector holder 110.