The 991-173184-901 from M2 Global Technology is a RF & Microwave Isolator with Frequency 17.3 to 18.4 GHz, Average Power Forward 15 W, Average Power Reverse 1 W, Insertion Loss 0.55 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-173184-901 can be seen below.