Stop removing caps and overfilling cells one by one. The Flow-Rite Pro-Fill system connects all your deep-cycle batteries into a single fill circuit -- attach a water line, fill until it stops, done. Automatic shut-off valves protect every cell from overfill, and the included flex manifolds handle the varied cell spacing found across most 6V and 12V battery configurations.
Deep-cycle flooded lead-acid batteries need regular watering to stay healthy -- but doing it right means checking each cell individually, which takes time and almost always results in either under- or overfilling. The Flow-Rite Pro-Fill BG-U48V-BG eliminates that guesswork entirely.
Each automatic shut-off valve replaces the existing vent cap on a battery cell. When you connect your fill hose and water source, water flows through the manifold tubing to every cell simultaneously. The moment a cell reaches the correct fill level, its valve closes -- automatically, without any float adjustment or manual monitoring. Remove the hose, replace the fill port cap, and you are done.
Float-activated valves stop water flow the instant each cell reaches proper level -- no overfill, no acid spill.
129 flex manifolds accommodate varied cell-to-cell spacing without forcing rigid tubing runs or custom cuts.
Designed for 8x6V batteries or 4x12V batteries wired to 48 volts -- common in golf carts, RV banks, and floor equipment.
One external fill port connects to all cells via the manifold loop. Fill all batteries in under a minute from a single access point.
This is a complete kit. Every component needed to plumb a standard 48V battery bank is in the box:
Underwatering exposes lead plates and causes permanent sulfation damage. Overfilling dilutes electrolyte and causes corrosive acid overflow onto battery tops and trays. Automatic shut-off valves maintain the exact correct electrolyte level in every cell, every fill -- protecting your battery investment and reducing maintenance time dramatically.
This system is designed for 48V flooded lead-acid deep-cycle battery banks. Common applications include:
This system is designed for standard flooded (wet cell) deep-cycle batteries with removable vent caps. It is not intended for AGM, gel, or sealed VRLA batteries, which do not require or support external watering.
No special tools are required for most installations. The shut-off valves thread directly into standard battery vent cap openings. Manifold tubing connects valve to valve across each battery, and inter-battery connections link the entire bank into a single loop. A single fill port mounts to an accessible location on the battery tray or adjacent panel.
Flow-Rite offers compatible hand pumps, gravity-feed bottles, and pressurized fill systems that connect directly to the Pro-Fill single-point port. These accessories allow fast, no-mess filling without carrying a hose to the battery compartment -- particularly useful in tight RV battery bays or enclosed golf cart battery trays.