The CZ1A1 from Sonoma Scientific is a RF & Microwave Isolator with Frequency 0.126 to 0.13 MHz, Average Power 1 kW, Average Power Forward 1 kW, Peak Power 20 kW, Insertion Loss 0.3 dB. Tags: Drop-In, Drop-In Isolator. More details for CZ1A1 can be seen below.