The T27A1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 27.5 to 30.5 GHz, Average Power 1 W, Average Power Forward 1 W, Insertion Loss 0.6 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for T27A1 can be seen below.