The C1ZK2 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.79 to 1.94 GHz, Average Power 100 W, Average Power Forward 100 W, Insertion Loss 0.3 dB, Isolation 24 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C1ZK2 can be seen below.