The GT-TFF-AL from PolyPhaser is a RF Surge Protector with Frequency DC to 7 GHz, Input Power 90 W, Insertion Loss 0.1 to 0.5 dB, Operating Temperature -50 to 85 Degree C, Surge Current 20 kA. Tags: Gas Discharge Tube. More details for GT-TFF-AL can be seen below.