Fill your entire 6V battery bank in seconds with one connection. The Flow-Rite Pro-Fill system replaces individual vent caps with precision automatic shut-off valves linked by 127-flex manifold tubing, so every cell tops off to exactly the right level -- no overfilling, no spills, no removing caps one by one.
Managing a bank of six 6V deep-cycle batteries -- typical in golf-cart-style RV house banks, solar storage arrays, and electric vehicle applications -- means filling up to 18 individual cells. The Flow-Rite Pro-Fill system collapses that chore into a single fill point. Connect a standard water source, squeeze the handle, and the automatic shut-off valves close the moment each cell reaches the correct electrolyte level.
The kit ships as a complete, matched system sized and pre-plumbed for a six-battery, 6-volt configuration. The 127-flex manifold tubing is flexible enough to route around battery terminals and hold-down hardware without kinking, and the winged shrouded valve bodies protect the fill ports from road debris and vibration.
Float-controlled valves stop flow the instant electrolyte reaches the correct level -- no guesswork, no overfill.
Visual charge/fluid-level sight glass lets you verify battery status at a glance without removing any caps.
Pre-cut flexible tubing connects all valves in a closed loop; routes around terminals and hold-downs without kinking.
Protective shrouds shield valve bodies from vibration, corrosion, and road debris common in RV and marine use.
This is a complete, ready-to-install system. Everything required for the six-battery installation ships in the box:
Note: A compatible water source hose or hand pump is not included. Flow-Rite and third-party fill pumps are sold separately.
Deep-cycle flooded lead-acid batteries lose water during every charge cycle. Running cells low -- even once -- causes sulfation on the exposed plates, permanently reducing capacity and lifespan. Consistent, correct-level watering is the single most impactful maintenance habit for a flooded battery bank. The Pro-Fill system removes the friction that causes people to skip it.
This kit is configured for six 6-volt deep-cycle flooded lead-acid batteries, the standard configuration for many RV house banks (commonly two strings of three 6V batteries wired in series-parallel for a 12V system). Typical compatible batteries include:
The Pro-Fill valves are designed to replace standard-thread vent caps on common 6V flooded batteries. Verify your battery's vent cap thread size matches Flow-Rite's standard valve thread before ordering. The system is not compatible with AGM, gel, or sealed (VRLA) batteries, which do not require watering and do not have removable vent caps.
Flow-Rite offers both "universal" kits (like this one, with flexible manifold tubing you route to your specific layout) and battery-specific kits pre-cut for exact models like Trojan T-105. The universal kit works across a wider range of battery brands and physical layouts, making it the right choice when your batteries are not from a single well-known model line or when your tray arrangement is non-standard.
Always water batteries after a full charge cycle, not before -- charging causes electrolyte to expand and pre-watering can cause overflow. Remove all vent caps before threading in the fill valves. Route manifold tubing away from battery terminals to prevent accidental shorts. Inspect tubing connections periodically for secure seating, especially after road travel.