The 990-440510-203 from M2 Global Technology is a RF & Microwave Circulator with Frequency 4.4 to 5.1 GHz, Average Power Forward 20 W, Insertion Loss 0.4 dB, Operating Temperature -20 to 70 Degree C. Tags: Drop-in Circulator. More details for 990-440510-203 can be seen below.