An adaptor for receiving a keystone type connector and insertion into a patch panel is provided, having a bottom wall with a ridge engaging lower slot and a lower edge engaging channel and a top wall having a flexible tab and a cantilevered latch engaging upper slot and an upper edge engaging channel in the flexible tab. The walls define a keystone modular jack receiving region and opening. The adaptor is dimensioned such that when the lower edge is received in the lower edge engaging channel, the upper edge is releasably engageable by the upper edge engaging channel, thereby releasably securing the adaptor within an aperture in a patch panel.