As a leading sealing and flow control manufacturer, SFC KOENIG® is built on core quality objectives that have not changed since the original company was founded in 1927: designing, manufacturing, integrating and supporting high-quality expander seal and flow control products. The SFC KOENIG® product line of metal-to-metal seal solutions provides industry-leading reliability in an easy-to-install, one-piece package. With over 5 billion parts installed and failure rates less than 1 PPM, customers around the world rely on us for precision sealing applications.

Learn more about our push-style KOENIG EXPANDER® and pull-style KOENIG EXPANDER® MODELS or click on the seal expander model below for quick access to sealing solution specifications. Use our Product Selector to quickly identify the best standard expander seal plug for your application.

HK Series KOENIG EXPANDER plugs are no longer available for sale into new applications or programs. Only the 3mm size will remain available for new applications. For all other diameters please see the SK series. Existing HK customers, please contact us for support.

Push TypePull Type
All Sealing ProductsSeries MBSeries CVSeries SK / SKCSeries LKInstallation Tools
All Sealing Products
Push Type
Series MB
Series CV
Pull Type
Series SK / SKC
Series LK
Installation Tools