The RC2025XS-037042 from ZTS Technologies is a RF & Microwave Circulator with Frequency 3.7 to 4.2 GHz, Average Power Forward 100 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC2025XS-037042 can be seen below.