Stop removing vent caps one by one. The BG-U24V-8J connects all your deep-cycle battery cells into a single-point watering network -- fill every cell to the correct level in under 60 seconds with no overfilling, no acid spills, and no guesswork.
Flooded lead-acid batteries require regular watering to stay healthy, but the traditional method -- pulling vent caps, checking levels, pouring distilled water into each cell individually -- is slow, messy, and easy to get wrong. Overfilling pushes electrolyte out of the cells; underfilling accelerates plate damage. Neither outcome is good for expensive house batteries.
The Flow-Rite Pro-Fill system replaces your existing vent caps with precision automatic shut-off valves interconnected by flexible tubing. You connect a water source to a single fill port, squeeze the trigger, and the valves close automatically when each cell reaches the correct electrolyte level. No measuring. No overfill. No acid on your hands or your battery tray.
The BG-U24V-8J is the universal 24-volt kit, sized to service a 4-battery bank of 6V deep-cycle batteries (8 cells total, 2 cells per battery) or a 2-battery bank of 12V deep-cycle batteries (12 cells total, 6 cells per battery). It ships with 128-inch flex manifold tubing pre-cut to connect standard battery configurations without additional cutting in most setups.
Float-actuated valves stop water flow the instant each cell hits the correct level -- no overfill, no dry-fill mistakes.
Pre-measured flexible tubing interconnects all cells and routes to a single fill port for one-step servicing.
Universal 24V configuration covers the most common RV and solar house-bank layouts without extra hardware.
Valves thread directly into standard battery fill ports, replacing OEM vent caps with no drilling or battery modification.
Properly maintained flooded batteries last significantly longer than neglected ones. A Pro-Fill system removes the friction from routine watering so it actually gets done on schedule. For RVers running large 6V golf-cart-style house banks, the time savings per service interval adds up fast -- and consistent watering prevents the low-electrolyte damage that kills batteries prematurely.
The BG-U24V-8J is designed for flooded (wet-cell) lead-acid deep-cycle batteries with standard threaded fill ports. Common compatible batteries include:
The automatic shut-off valves are designed to fit standard battery fill port threads used on the majority of North American flooded deep-cycle batteries. Confirm your battery's fill port thread size matches the Flow-Rite standard before ordering if you are using a less common battery brand.
This system is designed exclusively for flooded (wet-cell) lead-acid batteries that require periodic water addition. AGM, gel, and lithium (LiFePO4) batteries are sealed and do not require -- or accept -- external watering. Do not install this system on sealed battery types.
Installation requires no special tools beyond basic hand tools. The general process is:
Flow-Rite recommends using a dedicated Pro-Fill hand pump or gravity-feed bottle (sold separately) for best results. A standard garden hose at low pressure or a distilled-water jug with a hose adapter can also be used.
For the smoothest fills, Flow-Rite offers dedicated hand pumps and gravity-feed bottles designed to mate directly with the Pro-Fill quick-connect inlet. Using a matching pump eliminates drips at the connection and makes the entire process genuinely one-handed.