The 991-350510-301 from M2 Global Technology is a RF & Microwave Isolator with Frequency 3.5 to 5.1 GHz, Average Power Forward 20 W, Average Power Reverse 3 W, Insertion Loss 0.5 dB, Isolation 16 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-350510-301 can be seen below.