The RFCR2121 from RF-CI is a RF & Microwave Circulator with Frequency 380 to 430 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 RFCR2121 can be seen below.