The RFCR2127 from RF-CI is a RF & Microwave Circulator with Frequency 576 to 638 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 RFCR2127 can be seen below.