The ATi4-8 from Narda-ATM is a RF & Microwave Isolator with Frequency 4 to 8 GHz, Average Power 2 W, Average Power Forward 2 W, Peak Power Forward 0.02 kW, Insertion Loss 0.35 to 0.4 dB. Tags: Module with Connector, Coaxial Isolator. More details for ATi4-8 can be seen below.