The D19-M1819C01 from QUEST Microwave is a RF & Microwave Circulator with Frequency 1.85 to 1.99 GHz, Average Power Forward 200 W, Average Power Reverse 10 W, Insertion Loss 0.3 dB, Isolation 23 dB. Tags: Drop-in Circulator. More details for D19-M1819C01 can be seen below.