A novel patching device comprises discrete modules, each having a unitary molded housing which incorporates a pair of oppositely disposed (e.g., back-to-back) standard female modular jacks on a front face thereof. A rear face of the housing includes retaining means for retaining a printed circuit board having circuitry associated therewith which normally maintains a constant electrical interconnection between respective conductive pins in each of the jacks. This normally constant interconnection is interrupted or "pre-empted" when a known and standard modular plug is inserted into a jack whereby the resilient conductive pins are urged outwardly from contact with the printed circuit board. Each discrete module includes novel snap fitting means which permits disengageable snap fit attachment to an opening of a panel. Significantly, the module may be snap fit either from the front or opposed rear planar surface of the panel.