RoyalCraft TM Innovative Electric Dispenser Battery-Operated Home 5 Gallon Jug Drinking Bottled Water Pump. RoyalCraft TM electric water pump (BPA FREE), used for 5 gallon drinking water bottle. On/ Off button on the head of the pump,Easily operated On-Of switch. Economical. 2"D" size batteries will last for 8 to 10 months (based on 5 gallons per week usage). Able to discharge about 260 gallons (1.000liters) when used continuously. The bottles neck connect part can be changeable according to the different bottle neck size.