The C-8S43U-20 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 8.0 to to 12.4 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 0.4 dB, Isolation 18 dB. Tags: Coaxial Circulator. More details for C-8S43U-20 can be seen below.