Stop removing caps and guessing water levels. The Flow-Rite Pro-Fill BG-U72V-4A turns a tedious, corrosive maintenance chore into a single-hose, single-point fill for your entire 72-volt deep-cycle battery bank -- specifically engineered for installations where batteries are not evenly or standardly spaced, and where no central manifold is used.
Maintaining proper electrolyte levels in a 72-volt battery bank -- common in electric vehicles, large RV house banks, golf cars, and commercial equipment -- means pulling caps off multiple cells, checking each one with a hydrometer, and refilling without overfilling. Done wrong, it shortens battery life and creates a sulfuric acid hazard. The Flow-Rite Pro-Fill system eliminates all of that.
The BG-U72V-4A kit replaces the existing vent caps on each cell with Flow-Rite's automatic shut-off valves. Those valves are interconnected with the included tubing. Connect a water source to the single fill point, squeeze the trigger (or apply steady low pressure), and every cell fills automatically to its correct level. When the last cell is full, flow stops. No overflow, no guessing, no acid splash.
This "Universal" configuration ships without a manifold and with tubing lengths suited to non-standard battery spacing, so it works in custom tray arrangements, side-by-side configurations, and installations where a standard pre-routed kit would leave tubing too short or too long.
Valves stop flow precisely at the correct electrolyte level -- no overflow, no dry cells.
Tubing runs directly between valves, ideal for non-standard or custom battery spacing.
Shut-off valves thread into standard battery cell ports, replacing OEM vent caps.
Kit configured for a 72-volt bank -- typically six 12V batteries or twelve 6V batteries.
Deep-cycle flooded lead-acid batteries lose water during charging. Plates exposed above the electrolyte sulfate rapidly and permanently lose capacity. Overfilling washes away acid concentration and corrodes terminals. The Pro-Fill system hits the exact correct level every time, which directly extends battery service life and holds warranty compliance for many battery brands.
"Non-standard spacing" means batteries in your bank are not arranged in the uniform side-by-side rows that standard pre-cut kits assume. If your batteries are spread across an irregular tray, stacked, or separated by more than a few inches between groups, this universal kit is the correct choice. Standard spacing kits will have tubing that is too short to reach all cells.
The Flow-Rite Pro-Fill system uses a standard quick-connect port at the fill point. Flow-Rite's handheld trigger pump, gravity-feed reservoir, and powered pump units all connect directly. Look for Flow-Rite QC-P-P (hand pump) or compatible 3/8" quick-connect accessories to complete your watering station.