The RFLC-504-9G from RF-Lambda is a RF & Microwave Circulator with Frequency 8.5 to 9.5 GHz, Average Power Forward 20 W, Insertion Loss 0.35 dB, Isolation 35 dB, Operating Temperature -40 to 85 Degree C. Tags: Drop-in Circulator. More details for RFLC-504-9G can be seen below.