The 51-230-6-6 from Narda-MITEQ is a Waveguide Pressure Window with Frequency 15 to 22 GHz, Pressure 40 PSIG, Peak Power 100 kW, Power 500 W, Operating Temperature -40 to 120 Degree C. Tags: Rectangular. More details for 51-230-6-6 can be seen below.