12V 200W DC Immersion Water Heater Element 2 Inch BSP Fitting via the Supplied Brass Adaptor, Can be powered by many different Power Sources including Solar Panels and 12V Batteries, can be fitted to most water tanks or Cylinders with a 2inch BSP Bush,Please note this is a 2inch Fitting and not the more common 2.25 inch fitting built into a lot of immersion heater Cylinders, please check to ensure it is a 2inch bsp fitting you require before purchasing please.