The RFCR2123 from RF-CI is a RF & Microwave Circulator with Frequency 415 to 455 MHz, Average Power Forward 200 W, Average Power Reverse 200 W, Peak Power 1000 W, Insertion Loss 0.3 to 0.4 dB. Tags: Drop-in Circulator. More details for RFCR2123 can be seen below.