The RFSL3908 from RF-CI is a RF & Microwave Isolator with Frequency 3.9 to 4.7 GHz, Average Power Forward 50 W, Average Power Reverse 10 W, Peak Power Forward 0.5 kW, Insertion Loss 0.4 to 0.5 dB. Tags: Module with Connector, Coaxial Isolator. More details for RFSL3908 can be seen below.