The SDI-3442 from Sierra Microwave Technology is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power Forward 4 W, Peak Power Forward 200 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for SDI-3442 can be seen below.