The JCC0420T0450N20 from JQL Electronics is a RF & Microwave Circulator with Frequency 420 to 450 MHz, Average Power Forward 200 W, Insertion Loss 0.25 dB, Isolation 25 dB, Operating Temperature -30 to 60 Degree C. Tags: Coaxial Circulator. More details for JCC0420T0450N20 can be seen below.