Replacement Thermostat Housing with Auxiliary Port RAM with 5.9L and 6.7L Cummins Fleece PerformanceThe Fleece Performance replacement thermostat housing with auxiliary port is a direct replacement part for model years 1998. 5 2007 RAM with 5. 9L Cummins and 2013 2018 RAM with 6. 7L Cummins. The kit includes a port with plug to allow you to customize your coolant routings. Application Notes: Direct replacement for thermostat elbow included in our coolant bypass kits: FPE CLNTBYPS CUMM 0712 and FPE CLNTBYPS CUMM 1318. Features: Replacement Thermostat