The WVQ-336.5M-37BW01 from Wevercomm is a RF & Microwave Circulator with Frequency 318 to 355 MHz, Average Power Forward 50 W, Insertion Loss 0.5 to 0.6 dB, Isolation 18 to 19 dB, Operating Temperature -30 to 55 Degree C. Tags: Module with Connector, Coaxial Circulator. More details for WVQ-336.5M-37BW01 can be seen below.