This is a direct fit Replacement for the OEM Filter. Racor’s genuine high-efficiency long-life “depth coalescing media” replacement fuel filter. The PFF50216 has been tested to OEM standards for life, efficiency, water removal, and is now standard and backward compatible on all GM Duramax engine applications. The coalescing filter system inside has up to twice the life and improved water removal in all blends and types of diesel fuel when compared to other paper media filters.