The D13-M3643C01 from QUEST Microwave is a RF & Microwave Circulator with Frequency 3.6 to 4.3 GHz, Average Power Forward 30 W, Average Power Reverse 10 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Drop-in Circulator. More details for D13-M3643C01 can be seen below.