The RADI-4-8-Cryo-0.01-4K-S23-1WR-ss-b from Raditek is a RF & Microwave Isolator with Frequency 4 to 8 GHz, Average Power 1 W, Average Power Forward 1 W, Average Power Reverse 1 W, Insertion Loss 0.4 dB. Tags: Coaxial Isolator. More details for RADI-4-8-Cryo-0.01-4K-S23-1WR-ss-b can be seen below.