The T4YF2 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4.3 to 5.1 GHz, Average Power 5 W, Average Power Forward 5 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T4YF2 can be seen below.