The ACC-20120 from Atlantic Microwave is a RF & Microwave Circulator with Frequency 3.4 to 4.2 GHz, Average Power Forward 5 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature -10 to 65 Degree C. Tags: Coaxial Circulator. More details for ACC-20120 can be seen below.