The core of the Camco 50-Foot Heated Drinking Water Hose is made with an NSF 61 certified, drinking water safe hose that is BPA, phthalate and lead-free. The Heated Drinking Water Hose won’t leach harmful chemicals into your water or leave it tasting like plastic the way standard garden hoses do. It is ideal for RVs, livestock, agriculture, kennels and other industrial, commercial and residential uses. A self-regulating heating cable is ideal for water line freeze protection down to -40 degree Fahrenheit. The internal diameter of the hose is 5/8-inch, and the fittings are heavy-duty machined and plated for maximum corrosion resistance. The durable exterior jacket protects the water hose and electrical components from damage or exposure.