Stop pulling caps and guessing water levels. The Pro-Fill system replaces your vent caps with automatic shut-off valves and connects every cell through a single fill point -- fill all four batteries in seconds, not minutes, without spills or overfill.
RV and solar storage owners running four 6V deep-cycle batteries -- wired in series to form a 24V bank -- know how tedious individual cell maintenance can be. Cells are often recessed, hard to reach, and easy to overfill. The Flow-Rite BG-U24V-1A eliminates all of that.
Each kit includes precision-matched automatic shut-off valves that thread directly into your existing battery cell openings in place of the standard vent caps. The valves are pre-plumbed with interconnecting tubing, so every cell on every battery fills simultaneously from a single inlet port. When the electrolyte reaches the correct level, each valve closes on its own -- no float watching, no spillover, no acid burns.
This universal kit is sized specifically for batteries with 2.7 inch center-to-center cell spacing, the standard found on Trojan T-105, T-125, T-145, and comparable 6V deep-cycle batteries. It ships ready to install with no cutting or custom fitting required for those applications.
Each valve shuts off automatically when the cell reaches the correct electrolyte level -- no overfill, no guesswork.
One connection waters all four batteries at once. Works with a squeeze bottle, hand pump, or automatic watering gun.
Pre-sized for 2.7 inch cell spacing standard to Trojan T-105, T-125, and T-145 battery families.
Valves thread in by hand. Tubing snaps to barbed fittings. Most installations complete in under 30 minutes.
The BG-U24V-1A ships as a complete, ready-to-install assembly for four 6V batteries. The kit includes:
Note: A fill bottle, hand pump, or Flow-Rite watering gun (sold separately) is required to use this system. Distilled water is always recommended for deep-cycle battery maintenance.
Consistent, correct fill levels are one of the biggest factors in deep-cycle battery longevity. Overfilling dilutes electrolyte and causes corrosive overflow. Underfilling exposes plates and accelerates sulfation. The Pro-Fill system eliminates both failure modes by filling every cell to the manufacturer-specified level every time -- a meaningful upgrade for any RV owner doing regular battery maintenance.
This kit is engineered for the 2.7 inch cell-to-cell spacing found on popular Trojan 6V deep-cycle batteries. Common compatible batteries include:
If your batteries use a different cell spacing or a non-standard vent cap opening, verify dimensions before ordering. Flow-Rite offers kits in multiple cell-spacing configurations for other battery brands and bank sizes.
Four 6V batteries wired in series produce a 24V bank -- a common configuration in larger RVs, solar storage setups, electric vehicles, and golf carts. The "24V" designation in the part number reflects this four-battery series configuration, not a voltage rating of the watering system itself. The Pro-Fill valves are passive, gravity-and-pressure-fed devices with no electrical components.