The DC-340-173 from RF & Noise Components is a RF & Microwave Circulator with Frequency 330 to 350 MHz, Average Power Forward 250 W, Insertion Loss 0.4 to 0.5 dB, Isolation 20 to 23 dB, Return Loss 20 to 23 dB. Tags: Drop-in Circulator. More details for DC-340-173 can be seen below.