Flow-Rite battery watering products makes battery maintenance easy with a full line of single point battery watering systems and flip top watering caps. Fill batteries faster, safer, and more reliably than ever before with Millennium Evo, Pro-Fill, or Qwik-Fill on-board watering systems. Each application-specific system consists of automatic shut off valves interconnected with tubing that replace the existing vent caps. A quick coupling allows the system to be connected to a water supply. Once connected, water flows into each cell until it reaches the correct level. The entire process takes only 30 seconds per battery.