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 TankPosition: FrontMaterial: PPColor: BlackPin Number: 2To Radiator Inlet Hose Outer Diameter: 7.3mm / 0.29"To Radiator Outlet Hose Outer Diameter: 11.4mm / 0.45"Suitable for Expansion Tank Cover Diameter: 42.5mm / 1.67"Total Size: 270x200x180mm / 10.63"x7.87"x7.09"(L*W*H)OE Number: PCF000033, PCF000030, 17137501959Fitment:for BMW X5 E53 2004-2006 V8 4.4L Petrol Sport Utilityfor BMW X5 E53 2004-2006 V8 4.