LJXH 1inch DN25 BSP Low Voltage DC 12V/24V/48V Immersion Heating Element for Solar Water Heater 300W/600W 304SUS Product Name: Immersion Heating ElementTube Length: 200mmTube Diameter: 8mmThread Size: 1" BSPVoltage: DC 12V/24V/48VPower: 300W/600WTube Material: 304 stainless steelThread Material: 304 stainless-steel Package Contents: 1 x heater/1 x gasket/1 x flange Please Note: Because the heating twine inside the heater tube is made of OCr25A15 which is Magnetic, it is common that the element would be adsorbed by way of magnet. The tube floor supplies is manufactured from stainless steel 304. If you're care about it, please do not make order.