The RFLC-405-2 from RF-Lambda is a RF & Microwave Circulator with Frequency 4 to 8 GHz, Bandwidth Bandwidth: 300 MHz, Average Power Forward 30 W, Peak Power 250 W, Insertion Loss 0.3 dB. Tags: Drop-in Circulator. More details for RFLC-405-2 can be seen below.