The RFCR6181B from RF-CI is a RF & Microwave Circulator with Frequency 400 to 470 MHz, Average Power Forward 250 W, Average Power Reverse 250 W, Peak Power 2500 W, Insertion Loss 0.40 to 0.50 dB. Tags: Coaxial Circulator. More details for RFCR6181B can be seen below.