The DC-1300-155 from RF & Noise Components is a RF & Microwave Circulator with Frequency 1.2 to 1.4 GHz, Average Power Forward 250 W, Insertion Loss 0.3 to 0.5 dB, Isolation 21 to 24 dB, Return Loss 21 to 24 dB. Tags: Drop-in Circulator. More details for DC-1300-155 can be seen below.