The 991-178193-901 from M2 Global Technology is a RF & Microwave Isolator with Frequency 17.8 to 19.3 GHz, Average Power Forward 10 W, Average Power Reverse 1 W, Insertion Loss 0.55 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-178193-901 can be seen below.