The QSC25R4 from Qualwave is a RF & Microwave Circulator with Frequency 350 to 4000 MHz, Bandwidth 50 MHz, Average Power Forward 100 W, Insertion Loss 0.4 to 0.5 dB, Isolation 18 to 23 dB. Tags: Surface Mount, Surface Mount Circulator. More details for QSC25R4 can be seen below.