The PPE 138051010 Heavy Duty Differential Cover for your 2001-2015 GM Duramax & 2003-2015 Dodge Cummins is cast from A356-T6 aluminum alloy, and prolongs life of rear differential gears by reducing oil temperature. Robust side ribs provide additional strength. Includes 3/8??? NPT stainless steel drain plug and 1??? sight level / fill plug with a powerful Neodymium magnet to attract & hold harmful ferrous metals. Easy installation with included fasteners. High quality CMP - 4000 high performance gasket.