The T3YL1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 3.5 to 4.2 GHz, Average Power 10 W, Average Power Forward 10 W, Insertion Loss 0.5 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for T3YL1 can be seen below.