TeraPump TRPMW300 Electric Drinking Water Pump [Excluding Glass] WARNING: Will Rust if you let water inside. So please be careful not to put the head upside down because water will get inside This pump is BPA FREE Fits most crown top 5 or 6 Gallon Bottles (both screw top and crown top finish bottles) / 1 Gallon per Minute U.S. Patented drinking water pump powered by electricity or (2) D batteries This drinking water pump can either be used with batteries, or it can be plugged into an outlet with its included power cord. Simply fasten this pump onto your bottle, plug it into the wall, and flip the switch on. Very practical and easy to use Fasten this pump onto your bottle. Plug into an outlet with its included power cord. Or use batteries. Flip the switch on. Press the pump, and enjoy drinking water.