The 90-230-6-6 from Narda-MITEQ is a Waveguide Pressure Window with Frequency 8.2 to 12.4 GHz, Pressure 40 PSIG, Peak Power 300 KW, Power 900 W, Operating Temperature -40 to 120 Degree C. Tags: Rectangular. More details for 90-230-6-6 can be seen below.