The RADII-4-12-Cryo-0.02-4K-S3-1WR-ss-b from Raditek is a RF & Microwave Isolator with Frequency 4 to 12 GHz, Average Power Forward 1 W, Average Power Reverse 1 W, Insertion Loss 1.2 to 2.4 dB, Isolation 12 to 24 dB. Tags: Coaxial Isolator. More details for RADII-4-12-Cryo-0.02-4K-S3-1WR-ss-b can be seen below.