The RADC-8-12-Cryo-4-77K-S3-1WR-M3.0-b from Raditek is a RF & Microwave Circulator with Frequency 7.5 to 12 GHz, Average Power Forward 0.5 to 1 W, Average Power Reverse 0.5 to 1 W, Insertion Loss 0.5 dB, Isolation 17 to 19 dB. Tags: Coaxial Circulator. More details for RADC-8-12-Cryo-4-77K-S3-1WR-M3.0-b can be seen below.