The RADI-8-12-Cryo-4-77K-S3-1WR-b from Raditek is a RF & Microwave Isolator with Frequency 8 to 12 GHz, Average Power Forward 1 W, Average Power Reverse 1 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Coaxial Isolator. More details for RADI-8-12-Cryo-4-77K-S3-1WR-b can be seen below.