The T4YL1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4 to 8 GHz, Average Power 10 W, Average Power Forward 10 W, Insertion Loss 0.6 dB, Isolation 18 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T4YL1 can be seen below.