King Electric SRP Pre-Assembled Self-Regulating Heating Cable, 75 ft, 450 Watt - 120 VoltThe King Electric SRP Heating Cables SRP Series 120V Pre Assembled Self Regulating Pipe Trace Heating Cable is designed for a variety of pipe freeze protection applications. The cable is constructed so that it will not burn out or overheat when overlapped, and can be used on metal and plastic pipes. The cable is pre terminated with a 30 inch cold lead, 120V grounded plug and end splice. Self regulating heating cable, often called pipe trace cable,