The IS-78-PI from MCLI is a RF & Microwave Isolator with Frequency 3.4 to 4.8 GHz, Average Power Forward 25 W, Peak Power Forward 0.25 kW, Insertion Loss 0.35 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Isolator. More details for IS-78-PI can be seen below.