The T4XU6 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4.35 to 5.05 GHz, Average Power 1 W, Average Power Forward 1 W, Insertion Loss 0.6 dB, Isolation 22 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T4XU6 can be seen below.