2011-2016 Duramax LML AC Delco Return Line Assembly

We use this return line assembly when doing CP3 conversions just to ensure the truck runs perfectly sound afterwards. When this line assembly goes bad, it will cause the truck to fall on it's face and drop all rail pressure. This is a genuine AC Delco unit and would only suggest using these. The aftermarket units have been problematic and faulty out of the package.