Transportation Seals, Flow Restrictors & Valves


Well-known automotive companies, including light, heavy and commercial vehicle and transportation system manufacturers, count on SFC KOENIG® expander seal, flow restrictor, and check valve solutions for optimized safety and reliability. With over 40 years’ experience, and as world leaders in automotive applications, we have developed and engineered extremely versatile solutions designed for closing drilled holes and restricting flow. SFC KOENIG solutions are found throughout the transportation sector, in applications such as engine blocks, transmission and driveline systems, valve trains and pneumatic control systems.

Our expander plugflow restrictors and check valves have been designed to be quick, easy and reliable to install, and they are extremely resilient, permanently resisting pressures of up to 500 bar. The quality control processes and solutions provided by SFC KOENIG meet the highest quality standards and maintain all the required certifications demanded for the stringent safety requirements of the automotive industry. SFC KOENIG provides the highest level of safety and reliability, with less than 1 PPM field failure rates and expertise in PPAP. Our long-standing partnerships with leading manufacturers are further proof of our best-in-class status.

From expander plugs to flow restrictors to check valves, our sealing and flow control solutions are used in many automotive and commercial transportation applications, including:

  • brake systems (air and hydraulic)
  • EV powertrain
  • camshafts
  • clutch systems
  • control valves on clutches
  • crank shafts
  • cylinder heads
  • drive shafts
  • drivelines
  • engines & engine blocks
  • engine covers
  • exhaust emission systems
  • fuel injection systems
  • gear housings
  • oil pumps
  • pneumatic control systems
  • rocker arm inlets & outlets
  • steering systems
  • trailer hitches
  • transmissions & transmission shafts
  • turbo chargers
  • vacuum pumps
  • valve trains
  • water pumps
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Product Selector


SFC Koenig provides automotive sealing solutions for a variety of industries