The IS-18-1 from MCLI is a RF & Microwave Isolator with Frequency 4 to 8 GHz, Average Power Forward 1 W, Peak Power Forward 0.1 kW, Insertion Loss 0.7 dB, Isolation 16 dB. Tags: Module with Connector, Coaxial Isolator. More details for IS-18-1 can be seen below.