The PE8311 from Pasternack Enterprises Inc is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Average Power Forward 10 W, Average Power Reverse 10 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Module with Connector, Coaxial Isolator. More details for PE8311 can be seen below.