The FMSP1042 from Fairview Microwave is a RF Surge Protector with Frequency DC to 24 GHz, Input Power 10 to 50 W, Insertion Loss 0.25 dB, Operating Temperature -40 to 85 Degree C, Return Loss 18 dB. Tags: Gas Discharge Tube. More details for FMSP1042 can be seen below.