The T3442/DD from Smiths Interconnect is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power Forward 60 W, Average Power Reverse 1 W, Peak Power Forward 0.5 kW, Insertion Loss 0.6 dB. Tags: Module with Connector, Coaxial Isolator. More details for T3442/DD can be seen below.