Genuine OEM Ford Thermostat Housing Hose, part number 1139030. This flexible hose connects the thermostat housing to another part of the engine's cooling system, facilitating the flow of coolant. It plays a vital role in regulating engine temperature. Made from heat-resistant rubber. Genuine OEM hoses are designed with specific internal diameters and wall thicknesses to withstand engine temperatures and pressures, ensuring reliable coolant circulation.