The DI-515-xxx from RF & Noise Components is a RF & Microwave Isolator with Frequency 470 to 560 MHz, Average Power Forward 250 W, Average Power Reverse 100 W, Insertion Loss 0.4 to 0.5 dB, Isolation 20 to 21 dB. Tags: Drop-In, Drop-In Isolator. More details for DI-515-xxx can be seen below.