The RFLC-203-4 from RF-Lambda is a RF & Microwave Circulator with Frequency 750 to 900 MHz, Bandwidth Bandwidth: 50 MHz, Average Power Forward 10 to 50 W, Insertion Loss 0.4 dB, Isolation 21 dB. Tags: Drop-in Circulator. More details for RFLC-203-4 can be seen below.