Feature:The coolant reservoir is attached to the radiator and the engine with hoses and is an important component of the cooling system, which holds the excess coolant fluid used to cool the engine.When a coolant expansion tank has any issues it can lead to issues that: Constantly low on coolant, coolant leaks, engine overheating.This is a non-OEM product, accessory only!Specification:Type: Coolant Radiator Reservoir TankPart Number: MJD4400ABMaterial: PlasticColor: BlackPosition: FrontSensor Includes: YesNumber of Pins: 2To Radiator Inlet Hose Diameter: 39mm / 1.54"To Radiator Outlet Hose Diameter: 16mm / 0.63"Size: 15.5x15x13cm / 6.10"x5.91"x5.12"(L*W*H)Fitment:for Jaguar XK8 Base 4.0L V8 - Gas 1997-2005for Jaguar XK8 Base, Edition 4.2L V8 - Gas 2006How to Replace:Turn off your car and allow your engine to cool down completely.