The RFCR6858 from RF-CI is a RF & Microwave Circulator with Frequency 3.4 to 4.2 GHz, Average Power Forward 50 W, Average Power Reverse 50 W, Peak Power 500 W, Insertion Loss 0.30 to 0.40 dB. Tags: Coaxial Circulator. More details for RFCR6858 can be seen below.