Tylan FC 550-1 Mass Flow Controller MFC 300 SCCM H2 FC 550 OEM Refurbished. Part No: FC 550-1. Model No: FC 550 Series. Range/Gas: 300 SCCM, H2. This Tylan FC 550-1 Mass Flow Controller MFC 300 SCCM H2 FC 550 OEM is refurbished surplus. Includes certificate of calibration record sheet. 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.