Hermetically Sealed Waveguide Connectors

Uni-Guide waveguide connectors are compact and versatile solutions for implementing waveguide ports on hermetically sealed electronic packages.   Environmental seals are achieved using the same industry-standard glass beads as those found in many coaxial connector kits. Using the same mounting holes, they are drop-in replacements for a variety of coaxial connector types. 

 https://www.eravant.com/products/uni-guide