The C1BU5 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.79 to 1.84 GHz, Average Power 250 W, Average Power Forward 250 W, Insertion Loss 0.2 dB, Isolation 25 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C1BU5 can be seen below.