The HX-T-2000-4000-18-25 from A-Info is a RF & Microwave Circulator with Frequency 2 to 4 GHz, Average Power Forward 25 W, Insertion Loss 0.6 dB, Isolation 18 dB, Operating Temperature -40 to 70 Degree C. Tags: Coaxial Circulator. More details for HX-T-2000-4000-18-25 can be seen below.