The T1AU4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.8 to 2 GHz, Average Power 50 W, Average Power Forward 50 W, Insertion Loss 0.2 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T1AU4 can be seen below.