The 991-127133-803 from M2 Global Technology is a RF & Microwave Isolator with Frequency 12.7 to 13.3 GHz, Average Power Forward 4 W, Average Power Reverse 10 W, Insertion Loss 0.8 dB, Isolation 38 dB. Tags: Drop-In, Drop-In Isolator. More details for 991-127133-803 can be seen below.