The DC-410-174 from RF & Noise Components is a RF & Microwave Circulator with Frequency 390 to 430 MHz, Average Power Forward 250 W, Insertion Loss 0.35 to 0.4 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB. Tags: Drop-in Circulator. More details for DC-410-174 can be seen below.