The QDC1620B from Qualwave is a RF & Microwave Circulator with Frequency 6000 to 18000 MHz, Bandwidth 12000 MHz, Average Power Forward 20 to 30 W, Insertion Loss 0.6 to 1.5 dB, Isolation 10 to 18 dB. Tags: Drop-In, Drop-in Circulator. More details for QDC1620B can be seen below.