Stop crawling over your battery bank with a funnel and a flashlight. The Flow-Rite Pro-Fill universal system connects all six of your 6V deep-cycle battery cells through a single manifold so you can water the entire bank in seconds -- no overfilling, no acid spills, no guesswork.
The BG-U36V-7A is Flow-Rite's universal Pro-Fill kit sized for banks made up of six 6V deep-cycle batteries -- a common configuration in RVs, fifth wheels, and solar storage systems running two sets of three 6V batteries in series-parallel. The kit ships ready to install: automatic shut-off valves replace your existing vent caps on each cell, and a 127-series flexible manifold interconnects all cells with pre-cut tubing runs.
Once installed, connect a standard garden hose or pump to the single fill port. Each valve opens when its cell needs water and closes automatically at the correct electrolyte level -- preventing overfill without any adjustment. Disconnect, replace the dust cap, and you're done. A battery bank that used to take 15-20 minutes to water properly now takes under a minute.
Each valve closes automatically when the cell reaches the correct water level -- no float adjustment needed.
Flexible tubing manifold routes between batteries regardless of terminal layout, accommodating most battery case sizes.
Raised wings and a shroud protect the valve body from side impact and keep the fill port seated securely in the cell opening.
Fits standard Group 24, GC2, and similarly sized 6V deep-cycle battery cases with standard vent cap openings.
Six-volt golf-cart-style deep-cycle batteries have thicker plates and deeper electrolyte wells than 12V batteries. They cycle harder and consume more water -- especially in hot climates or when used with solar charging. Checking each individual cell manually is time-consuming and easy to skip. A Pro-Fill system makes proper watering routine rather than a chore, extending battery life and protecting your investment.
Always fill deep-cycle batteries after a full charge cycle, not before. Charging causes electrolyte to expand; filling before charging can cause overflow and acid spills. The Pro-Fill system prevents overfill at the valve level, but starting with a properly charged battery is essential for accurate fill levels.
The Pro-Fill system is compatible with Flow-Rite's hand-pump bottles, 12V battery-powered fill pumps, and standard garden hose fittings. If your battery compartment is difficult to access, a dedicated fill pump with a long wand makes the process even faster. Flow-Rite also offers replacement valves and tubing separately if individual components need service down the road.