The E4XA1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4 to 18 GHz, Average Power 5 W, Average Power Forward 5 W, Insertion Loss 1.5 dB, Isolation 15 dB. Tags: Module with Connectors, Coaxial Isolator. More details for E4XA1 can be seen below.