Stop removing vent caps and checking cells one at a time. The BG-U24V-7J installs directly on four series-connected 6V Trojan Plus batteries and lets you water the entire bank from a single external fill point -- no overfilling, no acid spills, no guesswork.
The Flow-Rite Pro-Fill BG-U24V-7J is a universal-fit battery watering kit engineered specifically for a bank of four (4) 6V Trojan Plus series batteries wired in series to form a 24V system -- a common configuration in RVs, golf carts, floor scrubbers, and off-grid solar setups. Each cell in every battery gets its own automatic-shutoff valve. When you connect a water source and squeeze the fill handle, all cells fill simultaneously to the correct level, then the valves close automatically. You never remove a vent cap again during routine maintenance.
The "Universal" designation means the kit uses adjustable interconnect tubing that can be routed around battery hold-downs, cables, and terminals regardless of battery orientation or tray layout -- left-to-right, right-to-left, or back-to-front arrangements are all accommodated.
Float valves in each cell stop flow at the correct electrolyte level -- every cell, every time.
One external quick-connect port fills all 4 batteries at once. No more pulling caps on 16+ individual cells.
Flexible interconnect tubing adjusts to your exact tray layout regardless of battery orientation.
Valves are sized and spaced to fit Trojan Plus 6V battery vent openings directly -- no adapter rings needed.
The number-one cause of premature deep-cycle battery failure is inconsistent watering -- cells that run low expose plates and sulfate, while overfilled cells push acid out and corrode terminals. Pro-Fill valves eliminate both problems by delivering exactly the right amount of distilled water to every cell every time. Batteries maintained with a watering system consistently outlast hand-watered banks.
This kit is designed and sized for four (4) Trojan Plus 6V deep-cycle batteries (such as Trojan T-105-PLUS, T-125-PLUS, and similar Plus-series cells). The batteries are typically wired in series to produce a 24V bank. Common applications include:
Flow-Rite sells both battery-specific kits (pre-cut tubing for exact Trojan or US Battery tray dimensions) and "Universal" kits like this BG-U24V-7J. The Universal version uses adjustable tubing lengths, making it the right choice when your tray layout, cable routing, or battery spacing does not match a standard factory configuration -- for example, after a battery upgrade, a custom tray build, or when mixing a replacement brand that uses the same 6V cell size.
Installation does not require tools beyond a small flathead screwdriver and a utility knife to trim tubing. The general process is:
Always fill flooded lead-acid batteries with distilled or deionized water. Tap water contains minerals and chlorine that contaminate electrolyte and degrade battery capacity over time. Never add electrolyte (acid) through the Pro-Fill system.
The BG-U24V-7J fill port is compatible with Flow-Rite's hand-squeeze fill bottles and gravity feed systems. For large battery banks or frequent maintenance schedules, consider Flow-Rite's pump-fed filling station for faster, hands-free filling.