With more than 3 billion parts installed and failure rates < 1 PPM, SFC KOENIG is the global leader in sealing and flow control technology. The company's product line includes: the KOENIG EXPANDER - an engineered metal-to-metal expander seal the KOENIG RESTRICTOR - for precise fluid flow control the KOENIG CHECK VALVE - for forward and reverse flow control applications. a variety of installation tooling and equipment. The original inventor of the one-piece, metal-to-metal sealing solution, SFC KOENIG components provide unmatched reliability, security and performance. Expert engineers are available to develop a solution for your unique application. Certifications include: ISO 14001, ISO AS/EN 9100, ISO TS 16949 and ISO 9001.