The T27A4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 27.7 to 31 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 T27A4 can be seen below.