The IS-5 from MCLI is a RF & Microwave Isolator with Frequency 3.9 to 4.6 GHz, Average Power Forward 50 W, Peak Power Forward 0.1 kW, Insertion Loss 0.6 dB, Isolation 17 dB. Tags: Module with Connector, Coaxial Isolator. More details for IS-5 can be seen below.