The 42-230-6-6 from Narda-MITEQ is a Waveguide Pressure Window with Frequency 18 to 26.5 GHz, Pressure 40 PSIG, Peak Power 75 KW, Power 400 W, Operating Temperature -40 to 120 Degree C. Tags: Rectangular. More details for 42-230-6-6 can be seen below.