Description This is the water pump used in OM603 water pump upgrade. The parts below are required to complete the conversion: Water Drain Pipe - OM603/OM606 Water Pump Housing - OM606 Thermostat - OM603/OM606 - 80��������� Thermostat Cap - OM606 Water Pump Housing Gasket - OM606 Water Pump Pulley - OM606 Special oreder part.