The RFCR2151 from RF-CI is a RF & Microwave Circulator with Frequency 570 to 670 MHz, Average Power Forward 300 W, Average Power Reverse 300 W, Peak Power 1000 W, Insertion Loss 0.35 to 0.5 dB. Tags: Drop-in Circulator. More details for RFCR2151 can be seen below.