The ECF504-AB is a flange-mounted USB A-to-B adapter coupler kit designed for panel-integrated connectivity applications. The kit includes a shielded coupler, a zinc alloy flanged adaptor, and stainless steel mounting screws (4-40 x 1/4"), providing a complete assembly solution for USB connectivity. The flanged adaptor features a recommended panel opening of 0.75 inches [19.1 mm] and overall dimensions of 1.36 inches [34.4 mm] in length with a 0.900 inch [22.9 mm] width, secured with two #4-40 UNC-2B threaded holes. This adapter is RoHS compliant and is commonly used in industrial equipment, computer peripherals, and telecommunications systems where space-constrained panel mounting and reliable USB connectivity are required.