The RFSL2959D from RF-CI is a RF & Microwave Isolator with Frequency 10 to 12.5 GHz, Average Power Forward 25 W, Average Power Reverse 2 W, Peak Power Forward 0.25 kW, Insertion Loss 0.35 to 0.4 dB. Tags: Drop-In, Drop-In Isolator. More details for RFSL2959D can be seen below.