The RC2528BS-034042 from ZTS Technologies is a RF & Microwave Circulator with Frequency 3.4 to 4.2 GHz, Average Power Forward 100 W, Insertion Loss 0.5 dB, Isolation 20 dB, Operating Temperature -30 to 70 Degree C. Tags: Module with Connectors, Coaxial Circulator. More details for RC2528BS-034042 can be seen below.