Stop pulling vent caps and guessing water levels. The BG-U12V-7A replaces your existing vent caps with automatic shut-off valves interconnected by 127 flex manifold tubing -- turning a tedious, corrosive chore into a single-point fill that takes seconds and never overfills.
If you run two 6V Trojan Plus batteries in series for your RV house bank, coach, or golf cart, the BG-U12V-7A is engineered specifically for that configuration. Each cell gets its own automatic float shut-off valve that stops water flow the instant the electrolyte reaches the correct level. No measuring, no overfilling, no battery acid on your hands or tray.
The kit ships with 127 flex manifold tubing pre-cut and sized for the Trojan Plus cell spacing. Connect your water source to the single fill port, squeeze the trigger, and all cells fill simultaneously to the proper level.
Float valves stop flow at the correct electrolyte level -- no timer, no guesswork, no overflow.
Pre-fitted flexible tubing routes between cells without kinking, sized for Trojan Plus cell spacing.
One connection fills all cells at once -- compatible with Flow-Rite hand pump or gravity feed systems.
Valve assemblies thread into existing vent cap openings. No drilling, no battery modification required.
Flow-Rite ships this as a complete, ready-to-install assembly for two 6V batteries. You will receive:
A water source (hand pump, wall-mounted pump, or gravity reservoir) is sold separately. Flow-Rite's hand pump and portable filler bottles connect directly to the inlet fitting on this kit.
Flooded lead-acid and AGM batteries that are consistently watered to the correct level last measurably longer. Low electrolyte exposes plates to air, causing sulfation and permanent capacity loss. Overfilling dilutes electrolyte and causes corrosive spills on battery trays and cables. The Pro-Fill system eliminates both failure modes on every fill cycle.
This kit is designed for the Trojan Plus 6V series, which is a common deep-cycle choice for:
The "Plus" designation in the Trojan line indicates an extended-height cell configuration with a slightly different vent cap diameter and cell spacing compared to the standard T-105 or T-145 series. The BG-U12V-7A manifold geometry and valve thread sizing are matched to the Plus series. If you have standard (non-Plus) Trojan 6V batteries, verify the vent cap thread spec before ordering -- Flow-Rite offers separate kits for T-105 and T-145 configurations.
Pro-Fill automatic valves are designed for low-pressure gravity or hand-pump filling. Do not connect this system directly to a pressurized tap or garden hose without a flow-control regulator. Excessive pressure can hold valves open past the shut-off point and cause overfill. Flow-Rite recommends their dedicated hand pump or gravity-feed reservoir for best results.
Flow-Rite's dedicated Pro-Fill hand pump or portable filler bottle connects directly to the inlet fitting on this kit. Using a matched Flow-Rite pump ensures correct flow pressure and prevents valve bypass. Compatible pumps are sold separately -- search "Flow-Rite Pro-Fill pump" to find the correct model for your setup.