The RFCR8919 from RF-CI is a RF & Microwave Circulator with Frequency 4.7 to 9.7 GHz, Average Power Forward 20 W, Average Power Reverse 30 W, Peak Power 250 W, Insertion Loss 0.5 to 0.6 dB. Tags: Drop-in Circulator. More details for RFCR8919 can be seen below.