The FMSP1038 from Fairview Microwave is a RF Surge Protector with Frequency DC to 7 GHz, Input Power 9 to 90 W, Insertion Loss 0.1 to 0.6 dB, Operating Temperature -55 to 85 Degree C, Return Loss 15 dB. Tags: Gas Discharge Tube. More details for FMSP1038 can be seen below.