New Cummins ISX EGR Cooler. This EGR includes all the necessary o-rings & gaskets. This EGR Cooler fits Cummins ISX years 2002, 2003, 2004, 2005, and 2006. This EGR Cooler is not remanufactured! It is made of high quality stainless steel. No exchange necessary! No core deposit required! This EGR cooler also fits Generation 1 Cummins ISX 15 Engine found in 2003 to 2007 Freightliner, International, Kenworth, Peterbilt, Volvo, Western Star, & Mack HD Heavy Duty Trucks & Buses. It fits 2003 models manufactured after 9/31/2002. Replacment and proper function prevents coolant from leaking into the exhaust manifold. The inlet inside diameter is 1.83".