The T3ZH9 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.4 to 4.2 GHz, Average Power 20 W, Average Power Forward 20 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for T3ZH9 can be seen below.