Upgrade your plastic OEM or aftermarket engine coolant thermostat housing on your 6.7L Power Stroke with our more durable cast aluminum model! Our direct replacement thermostat housing works with all factory and replacement thermostats. New O-rings included with the kit. PROBLEM OVERVIEW COMPLAINT: Coolant leaks around the thermostat housing area, a low coolant level, or the smell of coolant during engine operation or after operation. CAUSE:A cracked thermostat housing will result in a coolant leak, potentially leading to engine overheating and damage. Visual Inspection: Carefully inspect the thermostat housing for cracks or damage. Pressure Test: Perform a coolant system pressure test to ensure the system maintains pressure and observe for leaks at all split lines, including the thermostat housing and coolant crossover manifold. SOLUTION: The Fleece Performance thermostat housing upgrade is a drop-in, direct factory replacement for the weak plastic housing that can become brittle overtime! Application Notes Replaces Ford Part Number: RH315 (LC3Z8592B) and Dorman Part Number 902-1074 Fits the following vehicles: 2011-2025 F250 Super Duty 2011-2025 F350 Super Duty 2011-2025 F450 Super Duty 2011-2025 F550 Super Duty 2016-2019 F650 Super Duty 2016-2019 F750 Super Duty 2021-2026 F650 Super Duty 2021-2026 F750 Super Duty 2020-2025 F600 Super Duty