The PTRTNFTNF23S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 2.5 GHz, Input Power 37 to 1600 W, Insertion Loss 0.15 to 0.4 dB, Operating Temperature -40 to 90 Degree C, Surge Current 40 kA. Tags: Gas Discharge Tube. More details for PTRTNFTNF23S can be seen below.