The C1BU1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.76 to 1.96 GHz, Average Power 100 W, Average Power Forward 100 W, Insertion Loss 0.35 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C1BU1 can be seen below.