The C1BK1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.93 to 1.99 GHz, Average Power 50 W, Average Power Forward 50 W, Insertion Loss 0.12 dB, Isolation 23 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C1BK1 can be seen below.