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Pro-Fill On-Board Battery Watering System, 6-volt RV Edition, provides the most convenient and accurate means of filling and maintaining proper battery water levels. Hard to reach batteries are just as easy to fill as batteries on a workbench. Several batteries can be filled safely and simultaneously from a single remote position without ever having to touch a battery or remove a cap. Pro-Fill’s automatic control valves ensure each cell is closed when the precise level is reached.