A85049601W12 is a QPL connector backshell accessory manufactured by Amphenol PCD, designed to provide strain relief, environmental protection, and EMI/RFI shielding at the termination area of circular connectors. This backshell is constructed from aluminum alloy with a cadmium olive drab over electroless nickel finish (W finish). The product is designed to meet SAE-AS85049 standard requirements and features coupling options that may include spin coupling with lock wire holes to prevent accidental decoupling. Common applications include military, aerospace, and harsh environment installations where reliable connector protection and shielding are critical.