LJXH DN25 DC 12V/24V/48V 300W 600W Heating Element For Solar Water Heater 1inch Tubular Heaters All 304 Stainless Steel Product Name: Tublar Heating ElementTube Length: 200mmTube Diameter: 8mmThread Size: 1" BSPVoltage: DC 12V/24V/36VPower: 300W/600WTube Material: 304 stainless steelThread Material: 304 stainless steel Package Contents: choose what you need Please Note: Because the heating wire contained in the heater tube is product of OCr25A15 which is Magnetic, it is usual that the detail would be adsorbed through means of magnet. The tube floor material is made from stainless-steel 304. If you are care about it, please don't make order.