The DC-424-177 from RF & Noise Components is a RF & Microwave Circulator with Frequency 415 to 432 MHz, Average Power Forward 250 W, Insertion Loss 0.3 to 0.4 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB. Tags: Drop-in Circulator. More details for DC-424-177 can be seen below.