The RFCR8503 from RF-CI is a RF & Microwave Circulator with Frequency 1.35 to 2.7 GHz, Average Power Forward 50 W, Average Power Reverse 50 W, Peak Power 500 W, Insertion Loss 0.5 to 0.7 dB. Tags: Drop-in Circulator. More details for RFCR8503 can be seen below.