The C4YS4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 4.4 to 5.15 GHz, Average Power 5 W, Average Power Forward 5 W, Insertion Loss 0.6 dB, Isolation 18 dB. Tags: Drop-In, Drop-In Isolator. More details for C4YS4 can be seen below.