Water all nine of your 8V deep-cycle batteries in a single, controlled fill. Flow-Rite's automatic shut-off valves stop flow the instant each cell reaches the correct level -- no overfilling, no acid spills, no cell-by-cell guesswork. Purpose-built for battery banks with 2.5-inch cell spacing, this kit is a direct drop-in upgrade for golf carts, RV house banks, and industrial floor equipment.
Manually watering a nine-battery 8V bank is tedious and error-prone. Overfilled cells dilute electrolyte and corrode terminals; underfilled cells sulfate plates and shorten service life. The Flow-Rite Pro-Fill system solves both problems by replacing every vent cap with a precision automatic shut-off valve. Connect a single water line, squeeze the trigger on your hand pump or QD fill gun, and the system distributes water to all 27 cells simultaneously -- stopping automatically when each cell reaches the factory-correct level.
The BG-U72V-6A is pre-configured for a nine-battery, 8V bank (72V nominal bank) with standard 2.5-inch center-to-center cell spacing. All interconnecting tubing is cut and routed for this specific configuration, so installation is straightforward even if you have never used a battery watering system before.
Float-actuated valves stop water flow the instant each cell hits the correct electrolyte level. Eliminates overfill on every cycle.
One QD connection waters all 27 cells across all 9 batteries in one step. Typical fill time under 2 minutes.
Interconnecting tubing is included and sized for the 2.5-inch cell-spacing layout of this 9 x 8V configuration.
Shut-off valve assemblies thread directly into standard vent cap openings -- no drilling or permanent battery modification required.
Deep-cycle lead-acid batteries -- flooded 6V, 8V, and 12V cells -- depend on correct electrolyte level to protect the plates. Industry data shows consistent, correct-level watering can extend flooded battery service life by 20-50% compared to irregular or imprecise manual watering. The Pro-Fill system makes correct-level watering effortless enough to do after every charge cycle, which is exactly when batteries should be watered.
Always water flooded lead-acid batteries after a full charge, not before. Electrolyte expands during charging; adding water to a discharged battery risks overflow and acid spills once the charge cycle completes. The Pro-Fill system works in seconds, so there is no excuse to skip this step.
Use distilled or deionized water only. Tap water contains minerals that accelerate plate sulfation and reduce capacity over time. The Flow-Rite hand pump (sold separately, part BG-QD-DP or equivalent) connects to a standard distilled water jug and mates directly to the QD inlet on this kit. A gravity-fed or pressurized supply line with a QD fitting also works -- the automatic shut-off valves protect against overpressure fill.