Description:Coolant overflow reservoirs capture antifreeze as it expands from the radiator, and return it there as it cools. The reservoir plays an important part in the health of your engine¡¯s cooling system, and if yours is cracked or damaged, your engine could overheat. Before that happens, replace it with an OE-equivalent unit from CA Auto Parts. Our coolant reservoirs are molded from the highest quality plastic and are designed as direct drop-in fitments. The reservoirs include caps, and are priced well below the cost of a dealer-supplied unit. Specifics and Features: Direct Replacement for Factory Coolant Reservoir Made of High Quality Polypropylene No Modification Required for Installation With Pump, With Fluid Level Sensor, Caps OE/OEM Part Number: F77Z17618APackage Includes: 1 X Combination Coolant Reservoir / Windhield Washer Fluid ReservoirCompatible With: 1998-2001 Ford Explorer 1998-2001 Mercury Mountaineer With Dual Outlet Washer Pump