The GTH-NFF-AL from PolyPhaser is a RF Surge Protector with Frequency DC to 6 GHz, Input Power 1000 W, Insertion Loss 0.1 to 0.25 dB, Operating Temperature -55 to 85 Degree C, Operating Voltage 60 V. Tags: Gas Discharge Tube. More details for GTH-NFF-AL can be seen below.