Product Description For UL Certified Immersion Heater Cartridge Heating Element Igniter for Quadrafire Electric Air Heater Core Component The typical structure of a single-ended tube is generally composed of five key parts: aislante, material de sellado, varilla de salida,relleno, alambre calefactor, tubo de funda metálica y terminal. The spiral-shaped heating wire and the lead-out rod are located at…