Restore proper fuel return flow, leak-free operation, and dependable fuel system performance on your 2011-2016 GM 6.6L Duramax LML/LGH with this genuine Bosch fuel injector return line assembly. This direct-replacement return line assembly helps correct fuel return concerns such as leaks, fuel odor, hard starting, air intrusion, damaged fittings, and related drivability issues. Bosch: 0445130020, 0 445 130 020 Installation Note: Inspect injector return connections, seals, and related fittings during installation. Fitment Note: Verify build date, VIN, engine application, emissions package, and existing return line configuration before ordering.