The ETC0175 from Nova Microwave is a RF & Microwave Circulator with Frequency 1.71 to 1.8 GHz, Average Power Forward 250 W, Average Power Reverse 100 W, Insertion Loss 0.2 dB, Isolation 22 dB. Tags: Drop-In, Drop-in Circulator. More details for ETC0175 can be seen below.