The IS-59-20 from MCLI is a RF & Microwave Isolator with Frequency 1 to 2.6 GHz, Average Power Forward 20 W, Peak Power Forward 0.1 kW, Insertion Loss 0.3 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Isolator. More details for IS-59-20 can be seen below.