The RFCR2898D from RF-CI is a RF & Microwave Circulator with Frequency 3.6 to 4.2 GHz, Average Power Forward 25 W, Average Power Reverse 50 W, Peak Power 500 W, Insertion Loss 0.35 to 0.5 dB. Tags: Drop-in Circulator. More details for RFCR2898D can be seen below.