The UIYDI4550A from UIY Inc. is a RF & Microwave Isolator with Frequency 250 MHz to 1.5 GHz, Average Power Forward 100 to 300 W, Average Power Reverse 30 W, Insertion Loss 0.4 to 0.45 dB, Isolation 18 to 23 dB. Tags: Drop-In, Drop-In Isolator. More details for UIYDI4550A can be seen below.