The IS-131 from MCLI is a RF & Microwave Isolator with Frequency 1.2 to 1.5 GHz, Average Power Forward 1 W, Insertion Loss 1 dB, Isolation 12 dB, Operating Temperature 0 to 50 Degree C. Tags: Module with Connector, Coaxial Isolator. More details for IS-131 can be seen below.