The RFLI-301-4 from RF-Lambda is a RF & Microwave Isolator with Frequency 2 to 4 GHz, Average Power Forward 100 W, Average Power Reverse 1 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connector, Coaxial Isolator. More details for RFLI-301-4 can be seen below.