The 991-450530-201 from M2 Global Technology is a RF & Microwave Isolator with Frequency 4.5 to 5.3 GHz, Average Power Forward 50 W, Average Power Reverse 10 W, Insertion Loss 0.5 dB, Isolation 19 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-450530-201 can be seen below.