The T3442/DC from Smiths Interconnect is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power Forward 120 W, Average Power Reverse 1 W, Peak Power Forward 0.5 kW, Insertion Loss 0.3 dB. Tags: Module with Connector, Coaxial Isolator. More details for T3442/DC can be seen below.