The IS-3/NF from MCLI is a RF & Microwave Isolator with Frequency 1.03 to 1.09 GHz, Average Power Forward 50 W, Insertion Loss 0.6 dB, Isolation 17 dB, Operating Temperature -10 to 40 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for IS-3/NF can be seen below.