The GL-T-3000-4000-20-10 from A-Info is a RF & Microwave Isolator with Frequency 3 to 4 GHz, Average Power Forward 10 W, Average Power Reverse 5 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Isolator. More details for GL-T-3000-4000-20-10 can be seen below.