The DC-410-175 from RF & Noise Components is a RF & Microwave Circulator with Frequency 400 to 420 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-410-175 can be seen below.