Abstract: A feedthrough for use in a vacuum chamber is provided and includes a hollow tube having a length, an inner circumference, and a first recess located within the inner circumference. The feedthrough also includes a first O-ring captured by the first recess within the hollow tube. The feedthrough further includes a rod extending through an entirety of the length of the hollow tube. An outer circumference of the rod is configured to contact an entirety of an inner circumference of the first O-ring, and a vacuum fitting is fixedly secured to the hollow tube.

Abstract: An interlocking paver system including a polygon paver and a spacer paver is provided. The polygon paver may have a top level having a top level polygon paver perimeter and a bottom level secured to and protruding from the top level and having a bottom level polygon paver perimeter contained within the top level polygon paver perimeter. The spacer paver may have a top level having a top level spacer paver perimeter and a bottom level secured to and protruding from the top level and having a bottom level spacer paver perimeter extending beyond an entirety of the top level spacer paver perimeter The spacer paver may be configured to selectively interlock with the polygon paver. The top level spacer paver perimeter, top level polygon paver perimeter, and bottom level spacer paver perimeter are different from one another.