The RFLC-301-4S from RF-Lambda is a Space Qualified Circulator with Frequency 2 to 4 GHz, Bandwidth 2000 MHz, Average Power Forward 100 W, Insertion Loss 0.6 to 0.7 dB, Isolation 15 to 17 dB. Tags: Module with Connector, Coaxial Circulator. More details for RFLC-301-4S can be seen below.