Rein OE Quality Water Pump Replacement Kit with upgraded metal impeller comes complete with steel gasket, thermostat assembly, multi-rib drive belt, all accessory drive belt tensioners and idlers as well as all needed hardware. The engine bays in some rear and mid-engine sports cars can be extremely tight, often requiring technicians to drop the engines to repair the major coolant and belt drive components. Replacing all included components, including the thermostat housing which is prone to heat crack, assures that weak points have been addressed avoiding future breakdowns or reliability issues.