The CY4H1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 400 to 450 MHz, Average Power 1.25 kW, Average Power Forward 1.25 kW, Insertion Loss 0.4 dB, Isolation 20 dB. Tags: Module with Connectors, Coaxial Isolator. More details for CY4H1 can be seen below.