30FT Self Regulating Pipe Heat Cable, Automatic Electric Heat Kit Heating Cable, Water Pipe Heat Cable for Pipe Freeze Protection, 120V, ETL ListedQUALITY HEAT CABLE keeping your pipes water lines from freezing during the winter,functioning perfectly for all kinds of plastic and metal pipes (including copper, galvanized, ABS plastic, PVC plastic pipes, etc), not suitable for gutters, hoses SELF REGULATING TECHNOLOGY the cable output will change automatically depend on the ambient temperature, the output goes up when the temp is low and goes down when it's high, saving energy and electricity for