The UIYBCC5377B from UIY Inc. is a RF & Microwave Circulator with Frequency 300 to 475 MHz, Average Power Forward 60 W, Average Power Reverse 60 W, Insertion Loss 0.8 to 1.2 dB, Isolation 14 to 18 dB. Tags: Coaxial Circulator. More details for UIYBCC5377B can be seen below.