The T3XD1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Insertion Loss 0.4 dB, Isolation 18 dB, Operating Temperature -20 to 70 Degree C. Tags: Module with Connectors, Coaxial Isolator. More details for T3XD1 can be seen below.