The RC2123BS-040080 from ZTS Technologies is a RF & Microwave Circulator with Frequency 4 to 8 GHz, Average Power Forward 50 W, Insertion Loss 0.6 dB, Isolation 18 dB, Operating Temperature -10 to 60 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC2123BS-040080 can be seen below.