9milelake Cold Weather Pipe and Valve Heating Cable with Built-in Thermostat - 18 Feet Pre-assembled for easy installation,Easy Heat pipe heating cable installs quickly and easily to keep Includes grounded plug, built in thermostat, and instructions, Each cable consists of tough PVC inner insulation, a continuous ground braid, and weather-resistant units are activated and de-activated by an integral energy-saving thermostat Approved for rigid plastic and metal pipe