The WVQ-3200M-400BW01 from Wevercomm is a RF & Microwave Circulator with Frequency 3.6 to 4.2 GHz, Average Power Forward 200 W, Peak Power 1800 W, Insertion Loss 0.3 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Circulator. More details for WVQ-3200M-400BW01 can be seen below.