Feed-through coupler for one USB Type A male cable connector and one USB Type B male cable connector Our keystone snap-in modules provide a full range of solutions for voice, home networking, home office, audio/video and more. With the wide selection of snap-in modules, you can custom-configure your keystone wall plates and patch panels for greater control and more flexibility. Use this coupler for one USB Type A male cable connector and one USB Type B male cable connector; just snap it into patch panels, compatible wall plates and surface boxes.