The F9-M3643T01 from QUEST Microwave is a RF & Microwave Isolator with Frequency 3.6 to 4.3 GHz, Average Power Forward 5 W, Average Power Reverse 1 W, Insertion Loss 0.5 dB Max., Isolation 18 dB. Tags: Drop-In, Drop-In Isolator. More details for F9-M3643T01 can be seen below.