The T3XF1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.7 to 4.2 GHz, Insertion Loss 0.3 dB, Isolation 23 dB, Operating Temperature -30 to 65 Degree C. Tags: Module with Connectors, Coaxial Isolator. More details for T3XF1 can be seen below.