The ZCI20S-3.7-4.2-60A from ZTS Technologies is a RF & Microwave Isolator with Frequency 3.7 to 4.2 GHz, Average Power Forward 60 W, Insertion Loss 0.4 dB, Isolation 20 dB, Operating Temperature 10 to 60 Degree C. Tags: Coaxial Isolator. More details for ZCI20S-3.7-4.2-60A can be seen below.