The T1BU16 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.2 to 1.4 GHz, Average Power 300 W, Average Power Forward 300 W, Insertion Loss 0.3 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T1BU16 can be seen below.