The RWPW-3.4-4.2-WR229-FDM40-5kW-CW-a21 from Raditek is a Waveguide Pressure Window with Frequency 3.4 to 4.2 GHz, Pressure 15PSIG, Insertion Loss 0.2 dB, Power 5 kW. Tags: Rectangular. More details for RWPW-3.4-4.2-WR229-FDM40-5kW-CW-a21 can be seen below.