The WVI-15.8G-4GBW01 from Wevercomm is a RF & Microwave Isolator with Frequency 13.8 to 17.8 GHz, Average Power Forward 30 W, Average Power Reverse 5 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connectors, Coaxial Isolator. More details for WVI-15.8G-4GBW01 can be seen below.