The VFDI-3642 from VidaRF is a RF & Microwave Isolator with Frequency 3.6 to 4.2 GHz, Average Power Forward 1 W, Insertion Loss 0.5 dB, Isolation 18 dB, Operating Temperature -40 to 85 Degree C. Tags: Drop-In, Drop-In Isolator. More details for VFDI-3642 can be seen below.