The T3ZH12 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.4 to 3.8 GHz, Average Power 4 W, Average Power Forward 4 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for T3ZH12 can be seen below.