Abstract: A fiber optic cable retaining guide is adapted to be used with fiber optic cross connecting and inter-connecting devices. The guide is an open bottom and open top box having a back wall, a front wall, and two end walls with a retainer plate, the movement of which can vary a certain portion of the space delimited by the box elements and which has one surface coated with an elastomeric material to form a gasket, the other gasket being an elastomeric coated end wall of the end wall opposite to the elastomeric coated surface of the retainer plate. The front wall is hingeably attached to permit easy entry and removal of fiber optic cables into and out of the space delimited by the front wall, back wall, an end wall, and the movable retainer plate.