The C1DK4 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.35 to 1.45 GHz, Average Power 100 W, Average Power Forward 100 W, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Drop-In, Drop-In Isolator. More details for C1DK4 can be seen below.