The 991-440500-201 from M2 Global Technology is a RF & Microwave Isolator with Frequency 4.4 to 5 GHz, Average Power Forward 50 W, Average Power Reverse 3 W, Insertion Loss 0.5 dB, Isolation 19 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-440500-201 can be seen below.