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The 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 auxiliary port is threaded to accept a -10AN (7/8"-14) fitting to allow you to customize your coolant routings and includes port plug FPE-SP-7814. APPLICATION NOTES Direct replacement for thermostat elbow included in our coolant bypass kits: FPE-CLNTBYPS-CUMM-0712 and FPE-CLNTBYPS-CUMM-1318. Direct replacement for Cummins part numbers 5283433 and 3943297. Auxiliary port is threaded to accept a -10AN (7/8"-14) fitting.