The DH9-4-8G-1557 from COM-MW is a RF & Microwave Circulator with Frequency 4 to 8 GHz, Average Power Forward 10 W, Insertion Loss 0.5 dB, Isolation 15 dB, Operating Temperature -30 to 70 Degree C. Tags: Module With Connector, Coaxial Circulator. More details for DH9-4-8G-1557 can be seen below.