The 1081-004 from Southwest Antennas is a RF & Microwave Isolator with Frequency 1 to 2 GHz, Average Power Forward 100 W, Average Power Reverse 10 W, Peak Power Forward 250 W, Insertion Loss 0.5 dB. Tags: Module with Connector, Coaxial Isolator. More details for 1081-004 can be seen below.