The Pro-Fill Single Point Watering system is specifically designed for use with “golf car” style batteries commonly found in golf cars, sweepers, scrubbers, RV’s, pallet jacks, and small solar systems. Based on the same technology as our Millennium valves, our Pro-Fill system is compatible with all of our Millennium water supplies. The Pro-Fill SPW system works by replacing the batteries existing vent caps with patented valves that are interconnected with tubing, allowing the user to fill all cells of the battery from a single remote location. Each valve independently shuts off water flow to the cell when the proper electrolyte level is reached, allowing the batteries to be filled perfectly every time without even having to look at the batteries.