The T4YD1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4.2 to 4.4 GHz, Average Power 2 W, Average Power Forward 2 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for T4YD1 can be seen below.