Space Machine offers a standard product line of teflon / fiberglass pressure windows covering waveguide sizes WR28 thru WR430. VSWR is 1.10:1 maximum, while insertion loss is 0.1dB maximum over the full waveguide bandwidth. Pressure handling capability is 20 PSI minimum, however, higher capacities up to 30 PSI are usually obtained. Please specify pressure requirements when ordering. Additional sizes and configurations are available upon request. * Thickness noted when using a cover/cover flange configuration. When using a CPR or CMR flange type configuration, thickness is 0.25”. A choke flange face configuration requires a greater thickness.