The T1EJ4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.35 to 1.85 GHz, Average Power 70 W, Average Power Forward 70 W, Insertion Loss 0.5 dB, Isolation 18 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T1EJ4 can be seen below.