Stop wrestling with individual cell caps. The Flow-Rite Pro-Fill system interconnects your deep-cycle batteries with automatic shut-off valves so every cell fills to the correct level in a single pour -- no overfilling, no acid spills, no guesswork. Eagle Eye visual level indicator included so you can confirm charge state at a glance.
The Flow-Rite Pro-Fill BG-U24V-BA-EA is a complete universal watering kit engineered for 24-volt deep-cycle battery banks. It replaces your existing vent caps with spring-loaded automatic shut-off valves, then interconnects each cell with flexible manifold tubing. When you connect a water source to the single inlet fitting, water flows through all cells simultaneously and each valve closes the instant the electrolyte reaches the correct level. Overfilling is physically prevented by the valve mechanism -- no float adjustments, no measuring, no lifting heavy cells out of the tray.
Designed specifically for 24-volt configurations, this kit handles a four-battery bank of 6V cells wired in series-parallel (the most common RV golf-car-style setup) or a two-battery bank of 12V deep-cycle cells. It ships with the 129-flex manifold tubing system that accommodates a wide range of battery sizes and post spacings without cutting or special tools.
Spring-loaded float valves stop water flow the instant each cell hits the correct electrolyte level. No overfill, no acid spill.
Visual charge-state indicator tells you whether your battery bank needs attention before you hook up the charger or hit the road.
Pre-cut flexible manifold tubing routes between cells and batteries. Fits most standard and AGM-style deep-cycle battery sizes without modification.
Designed for 4x 6V or 2x 12V configurations. Single-point fill inlet simplifies maintenance in tight RV battery compartments.
Deep-cycle flooded lead-acid batteries in RVs, motorhomes, and solar storage banks need distilled water added regularly -- typically every 4 to 8 weeks under heavy use. Removing individual caps in a cramped battery bay risks acid contact, broken tabs, and inconsistent fill levels that shorten battery life. A Pro-Fill system lets you route the inlet tube to an accessible point outside the compartment and water the entire bank in under 60 seconds with zero cell access required.
The Pro-Fill system is designed for flooded (wet-cell) lead-acid deep-cycle batteries only. It is not compatible with sealed AGM, gel, or lithium batteries, which do not require water addition. Confirm your batteries are flooded/serviceable type before ordering.
Always fill with distilled or deionized water. Tap water minerals accelerate plate sulfation and void most battery warranties. A distilled water jug with a garden-hose-style pump connects directly to the Pro-Fill inlet for clean, mess-free filling.
For the cleanest fill experience, use a hand-pump or battery-powered distilled water transfer pump connected to a sealed jug. This keeps hands and tools away from electrolyte and gives you precise flow control when connecting to the Pro-Fill inlet.