The RFSL6112 from RF-CI is a RF & Microwave Isolator with Frequency 400 to 450 MHz, Average Power Forward 250 W, Average Power Reverse 20 W, Peak Power Forward 2 kW, Insertion Loss 0.3 to 0.4 dB. Tags: Module with Connector, Coaxial Isolator. More details for RFSL6112 can be seen below.