The PTCSAFSAF20G from NexTek, LLC. is a RF Surge Protector with Frequency DC to 12.5 GHz, Input Power 100 W, Insertion Loss 0.1 to 0.3 dB, Operating Temperature -40 to 90 Degree C, Operating Voltage 65 V. Tags: Gas Discharge Tube. More details for PTCSAFSAF20G can be seen below.