The 990-175185-501 from M2 Global Technology is a RF & Microwave Circulator with Frequency 1.75 to 1.85 GHz, Average Power Forward 220 W, Insertion Loss 0.3 dB, Operating Temperature -20 to 70 Degree C. Tags: Drop-in Circulator. More details for 990-175185-501 can be seen below.