Santa Fe; 3.3L. A circular disk covered in rubber or plastic with a hole in the center where the edge is sometimes tensioned by a spring that prevents fluid from leaking at the Engine Coolant Outlet Housing. Engine Coolant Outlet Flange. Engine Coolant Outlet Gasket. Engine Coolant Outlet O-Ring. O-Ring. Flange. Gasket. O - Ring. Seal. FITTING - WA. Thermostat outlt. Included with: Thermostat housing, Thermostat unit.