Fleece Performance Oil Cooler Adapter Duramax 2001-2007/2011-2016 6.6L

Upgrade your oil cooler mating surface with a new Fleece oil cooler adapter.  Unlike the original equipment oil cooler adapter, which depends on a metal gasket susceptible to leakage over time due to cooler flexing, the Fleece Performance adapter features a superior integrated square-cut seal ring on the oil cooler mating surface.  Slotted mounting holes on one end allow for easier installation.