Stop pulling vent caps and guessing at electrolyte levels. The Flow-Rite BG-U72V-1A Pro-Fill system connects all six cells of your 6V Trojan battery bank with a single tubing network -- fill every cell to the correct level in one shot, with automatic shut-off valves that stop the flow the moment the electrolyte reaches the right height.
Deep-cycle flooded lead-acid batteries -- the workhorse of RV house banks, golf carts, and solar storage systems -- require regular watering to stay healthy. Under-filling causes sulfation and premature death; over-filling pushes corrosive acid out of the battery. The Pro-Fill system eliminates both problems by automating the shutoff at precisely the correct fill level in every cell, every time.
The BG-U72V-1A is sized and tubed specifically for a bank of six 6V batteries (the common 12V or 24V series/parallel configurations used in RVs and golf carts) using Trojan-style cases with 2.7-inch center-to-center cell spacing. Each automatic shut-off valve threads into the cell opening where your existing vent cap was, and pre-cut interconnect tubing links all valves to a single fill point.
Float-controlled valves stop water flow the instant electrolyte reaches the correct level -- no guessing, no overflow.
One connection fills all cells simultaneously. No removing individual caps one by one -- the whole bank is done in under a minute.
Pre-cut tubing matches the 2.7" cell spacing of Trojan T-105, T-125, and T-145 style 6V batteries for a clean, professional install.
Valves replace standard vent caps on most flooded 6V deep-cycle batteries -- no drilling or battery modification required.
The BG-U72V-1A kit arrives ready to install on a six-battery 6V bank. Contents typically include:
Note: A hand pump or gravity-fed water source is used at the single fill port. External pump sold separately.
Flooded lead-acid batteries lose water through electrolysis during every charge cycle. Without regular topping-off with distilled water, the plates are exposed to air, causing irreversible sulfation. Consistent, accurate watering with a Pro-Fill system can add years to a quality battery bank and protect a significant investment.
This kit is configured for batteries with Trojan-style 6V cases and 2.7" cell-to-cell spacing. Common compatible batteries include:
Confirm your cell spacing before ordering. If your batteries use a different spacing (e.g., 2.4" or 3.1"), a different Flow-Rite kit configuration is required.
Always fill flooded lead-acid batteries with distilled or deionized water. Tap water contains minerals that contaminate the electrolyte and shorten battery life. Never add acid to a flooded battery during routine maintenance unless specifically directed by the battery manufacturer after electrolyte loss from spillage.