The C-2S74U-20 from Teledyne Microwave Solutions is a RF & Microwave Circulator with Frequency 2.0 to 4.5 GHz, Average Power Forward 50 W, Peak Power 1000 W, Insertion Loss 1.2 dB, Isolation 32 dB. Tags: Coaxial Circulator. More details for C-2S74U-20 can be seen below.