The T3742/DE from Smiths Interconnect is a RF & Microwave Isolator with Frequency 3.7 to 4.2 GHz, Average Power Forward 75 W, Average Power Reverse 1 W, Peak Power Forward 0.2 kW, Insertion Loss 0.4 dB. Tags: Drop-In, Drop-In Isolator. More details for T3742/DE can be seen below.