The D19-M2124C01 from QUEST Microwave is a RF & Microwave Circulator with Frequency 2.1 to 2.4 GHz, Average Power Forward 200 W, Average Power Reverse 10 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Drop-in Circulator. More details for D19-M2124C01 can be seen below.