Stop pulling individual vent caps and guessing water levels. The Flow-Rite Pro-Fill BG-U24V-7G-EA lets you water all your deep-cycle batteries in one shot -- one fill point, automatic shut-off at every cell, and the Eagle Eye visual indicator so you know exactly when the job is done.
Flooded lead-acid deep-cycle batteries need regular water -- but manually removing caps, checking levels with a hydrometer or flashlight, and topping off one cell at a time is slow, messy, and easy to get wrong. Overfill a cell and you dilute the electrolyte and corrode the terminals. Underfill and you sulfate the plates.
The Flow-Rite Pro-Fill system replaces your existing vent caps with automatic shut-off valves on every cell. The valves are interconnected with 127-flex manifold tubing routed to a single fill point. Connect a water source, fill until the system stops -- every cell gets exactly the right amount, every time.
This 24V configuration is sized for a 4x6V battery bank (common in RVs, golf carts, and floor machines) or a 2x12V battery bank. The Eagle Eye indicator gives you a clear go/no-go signal so you never have to second-guess whether the fill is complete.
Float-controlled valves stop water flow at the correct electrolyte level in every individual cell -- no overfill, no underfill.
Built-in visual indicator signals when the system is full so you can disconnect with confidence -- no guesswork.
Flexible manifold tubing routes around battery terminals and connectors without kinking -- works in tight battery compartments.
Designed for 4x6V or 2x12V deep-cycle battery configurations typical in RVs, marine applications, and electric vehicles.
Each Pro-Fill valve threads directly into the battery cell opening, replacing the factory vent cap. Inside each valve is a float mechanism -- when the electrolyte reaches the correct level, the float rises and seals the inlet port, stopping water flow to that cell. Because all cells are connected in series via the manifold tubing, a single external fill port services the entire battery bank.
Water pressure from a standard gravity feed or low-pressure water line pushes distilled water through the manifold. As each cell reaches capacity, its valve closes. When all cells are full, flow stops and the Eagle Eye indicator changes state, signaling completion. The process typically takes under two minutes for a fully depleted bank.
This 24V system fits any flooded lead-acid deep-cycle battery bank configured as:
The Pro-Fill valve is compatible with standard BCI cell opening sizes found on most flooded deep-cycle batteries including Trojan, US Battery, Crown, Deka, Interstate, and similar brands. Verify your battery cell opening thread size before ordering -- some industrial batteries use non-standard caps.
Tap water contains minerals and chlorine that accelerate plate degradation and can clog the float valves over time. Always use distilled or deionized water with this system. Most RV supply stores and big-box retailers carry distilled water in gallon jugs suitable for battery maintenance.
Always fill your batteries after a full charge cycle, not before. Charging causes electrolyte to expand. If you fill to the correct level before charging, the fluid will overflow during the charge cycle. Adding water post-charge ensures the Pro-Fill valves calibrate to the true full level.
For best results, use the Pro-Fill system as part of a regular maintenance routine: equalize charge monthly, water immediately after, and keep terminals clean and coated. A quality 24V smart charger with equalization mode extends battery life significantly when combined with consistent watering.