The CGS-2143 from Stellant Systems is a RF & Microwave Circulator with Frequency 2.05 to 4.25 GHz, Insertion Loss 0.5 dB, Isolation 17 dB, Operating Temperature 10 to 40 Degree C. Tags: Module with Connector, Coaxial Circulator. More details for CGS-2143 can be seen below.