The T1YS1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.2 to 1.4 GHz, Average Power 1.5 W, Average Power Forward 1.5 W, Insertion Loss 0.4 dB, Isolation 18 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T1YS1 can be seen below.