The RFSL6104B from RF-CI is a RF & Microwave Isolator with Frequency 400 to 500 MHz, Average Power Forward 250 W, Average Power Reverse 20 W, Peak Power Forward 2 kW, Insertion Loss 0.4 to 0.5 dB. Tags: Module with Connector, Coaxial Isolator. More details for RFSL6104B can be seen below.