The PTR7AF7AF35T1 from NexTek, LLC. is a RF Surge Protector with Frequency DC to 0.512 GHz, Input Power 550 W, Insertion Loss 0.1 to 0.2 dB, Operating Temperature -40 to 90 Degree C, Operating Voltage 350 V. Tags: Gas Discharge Tube. More details for PTR7AF7AF35T1 can be seen below.