The RFSL2921 from RF-CI is a RF & Microwave Isolator with Frequency 3.6 to 3.8 GHz, Average Power Forward 35 W, Average Power Reverse 20 W, Peak Power Forward 0.5 kW, Insertion Loss 0.25 to 0.35 dB. Tags: Drop-In, Drop-In Isolator. More details for RFSL2921 can be seen below.