Description 80 degree thermostat used in the OM603/OM606 engines, also in the OM 603 water pump upgrade.The parts below are required to complete the upgrade::Water Pump - OM606Water Drain Pipe - OM603/OM606Water Pump Housing - OM606Thermostat Cap - OM606Water Pump Housing Gasket - OM606Water Pump Pulley - OM606