The DC-510-182 from RF & Noise Components is a RF & Microwave Circulator with Frequency 500 to 520 MHz, Average Power Forward 250 W, Insertion Loss 0.3 to 0.35 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB. Tags: Drop-in Circulator. More details for DC-510-182 can be seen below.