WRAP-ON Pipe Heating Cable - 18-Feet, 120 Volt, Built-in Thermostat, Low Wattage - 31018 BUILT-IN THERMOSTAT - Turns the cable on at 38 degrees F and prevents frozen pipes to -50 degrees F - Simply wrap on, insulate and plug in. Insulation sold separately. PRESS-TO-TEST BUTTON - Exclusive feature to test cable before or after installation. ENERGY EFFICIENT - Uses up to 65% less energy at 2 watts per foot vs other cables at 7 watts per foot. USE ON ALL RIGID PIPES - PVC, CPVC, copper and metal pipes. MADE IN THE USA