The UIYDI2531A from UIY Inc. is a RF & Microwave Isolator with Frequency 410 MHz to 3.5 GHz, Average Power Forward 200 W, Average Power Reverse 150 W, Insertion Loss 0.3 to 0.6 dB, Isolation 18 to 23 dB. Tags: Drop-In, Drop-In Isolator. More details for UIYDI2531A can be seen below.