The PTRONFONF09S from NexTek, LLC. is a RF Surge Protector with Frequency DC to 3.2 GHz, Input Power 37 to 4500 W, Insertion Loss 0.1 to 0.25 dB, Operating Temperature -40 to 90 Degree C, Surge Current 50 kA. Tags: Gas Discharge Tube. More details for PTRONFONF09S can be seen below.