The T3YD1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.3 to 4.3 GHz, Average Power 0.5 W, Average Power Forward 0.5 W, Insertion Loss 0.8 dB, Isolation 50 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T3YD1 can be seen below.