The C1YD1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 1.215 to 1.4 GHz, Average Power 250 W, Average Power Forward 250 W, Peak Power 2.5 kW, Insertion Loss 0.3 dB. Tags: Module with Connectors, Coaxial Isolator. More details for C1YD1 can be seen below.