The FMIR1004 from Fairview Microwave is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Average Power Forward 100 W, Average Power Reverse 50 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for FMIR1004 can be seen below.