The RFSL2875D-T40 from RF-CI is a RF & Microwave Isolator with Frequency 4.2 to 4.4 GHz, Average Power Forward 50 W, Average Power Reverse 40 W, Peak Power Forward 0.5 kW, Insertion Loss 0.35 to 0.4 dB. Tags: Drop-In, Drop-In Isolator. More details for RFSL2875D-T40 can be seen below.