The DC-850-426 from RF & Noise Components is a RF & Microwave Circulator with Frequency 800 to 900 MHz, Average Power Forward 250 W, Insertion Loss 0.2 to 0.25 dB, Isolation 23 to 26 dB, Return Loss 23 to 26 dB. Tags: Drop-in Circulator. More details for DC-850-426 can be seen below.