The GL-T-12000-18000-18-20 from A-Info is a RF & Microwave Isolator with Frequency 12 to 18 GHz, Average Power Forward 20 W, Average Power Reverse 5 W, Insertion Loss 0.6 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for GL-T-12000-18000-18-20 can be seen below.