Seiko Seiki SCU-STC-L Turbomolecular Pump Temp Control NWA203000 AMAT Working. Edwards Part No: NWA203000. This Seiko Seiki SCU-STC-L is used working surplus. Only items pictured are included: If a part is not pictured, or mentioned above, then it is not included in the sale. Pictured test equipment is not included or available for sale. For items with multiple quantities: The pictured item is not necessarily the one that will be sent. Serial numbers or country of manufacture may vary.