The PE8304 from Pasternack Enterprises Inc is a RF & Microwave Isolator with Frequency 8 to 18 GHz, Average Power Forward 1 W, Average Power Reverse 1 W, Insertion Loss 0.6 dB, Isolation 16 dB. Tags: Module with Connector, Coaxial Isolator. More details for PE8304 can be seen below.