The WVQ-4100M-600BW01 from Wevercomm is a RF & Microwave Circulator with Frequency 3.8 to 4.4 GHz, Average Power Forward 10 W, Insertion Loss 0.5 dB, Isolation 20 dB, Operating Temperature -40 to 60 Degree C. Tags: Module with Connector, Coaxial Circulator. More details for WVQ-4100M-600BW01 can be seen below.