ULTRA HEAT ULTRAHEAT ® HOLDING TANK PIPE HEATER 3 INCH PIPEProduct DescriptionThe UltraHeat pipe heaters are designed to be used on electrically non conductive RV drain pipe as described under the Codes and Standards of the RV Industry for use within a Recreational Vehicle. All pipe and pipe elbow heaters are either on' or off' and are not controlled with a built in sensor like our RV tank heater models are equipped. They are designed to protect against fluid freezing within a pipe down to 11 Degree