The PCC-99A-1819 from Stellant Systems is a RF & Microwave Circulator with Frequency 1.8 to 1.9 GHz, Average Power Forward 100 W, Average Power Reverse 100 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Drop-In, Drop-in Circulator. More details for PCC-99A-1819 can be seen below.