The RFCR5912 from RF-CI is a RF & Microwave Circulator with Frequency 4.4 to 5 GHz, Average Power Forward 20 W, Average Power Reverse 20 W, Peak Power Forward 500 W, Insertion Loss 0.5 dB. Tags: Surface Mount, Surface Mount Circulator. More details for RFCR5912 can be seen below.