The C3ZX1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.98 to 4.378 GHz, Average Power 500 W, Average Power Forward 500 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C3ZX1 can be seen below.