Stop guessing when each cell is full. The Flow-Rite BA-120-BLK Pro-Fill manifold turns a messy, time-consuming six-cap battery watering routine into a single connection. Engineered specifically for the 8V Trojan T-875 with 2.3-inch cell spacing, this black swivel-tee manifold delivers water to every cell simultaneously and stops automatically when each cell reaches the correct electrolyte level -- no overfilling, no spills, no acid burns.
The Pro-Fill system by Flow-Rite is the industry standard for single-point battery watering in golf cart, RV, and industrial battery banks. The BA-120-BLK is the individual battery manifold designed to mate directly with the Trojan T-875 8-volt flooded lead-acid battery, matching its specific 2.3-inch center-to-center cell spacing exactly. Each manifold replaces all individual vent caps on a single battery and connects inline with neighboring manifolds via standard Pro-Fill quick-connect tubing.
The swivel tee fitting is a key detail: it allows the inlet/outlet connection to rotate freely during installation and routing, making it far easier to align tubing runs across a battery bank without stressing fittings or kinking hose. This is especially useful in tight battery compartments common to golf carts and RV chassis battery boxes.
Float valves inside each cell cap cut flow the moment the electrolyte reaches the correct level -- prevents overfilling automatically.
Rotating inlet/outlet tee simplifies hose routing in tight battery compartments and eliminates fitting stress.
Designed for 2.3-inch cell spacing matching the Trojan T-875 8V battery exactly -- no modification needed.
Connect one water line to the bank; all cells across all linked batteries fill in one step and shut off independently.
Flooded lead-acid batteries require regular watering -- typically every 4-6 weeks under normal cycling. Underwatered cells sulfate and lose capacity permanently. Overwatered cells push acid out during charging, corroding trays, cables, and surrounding structure. The Pro-Fill system eliminates both failure modes by automating the process. Owners who switch to Pro-Fill consistently report longer battery pack life and dramatically less maintenance time -- critical for full-timers and fleet operators who can't afford pack failures mid-season.
The BA-120-BLK manifold replaces the stock vent caps on a single 8V battery. A network of small-bore tubing connects multiple battery manifolds in series. At one end of the bank, a single fill point (hand pump, gravity reservoir, or automatic pump) introduces water. Internal float valves in each cell cap open when the cell needs water and close precisely at the correct electrolyte level. When all cells are satisfied, back-pressure signals the operator or shuts off an automatic pump. The swivel tee on this manifold serves as the in-line connection point between adjacent batteries in the series run.
The BA-120-BLK is designed for the standard Trojan T-875 8V battery only. The Trojan T-875 Plus and other Plus-series batteries use a different cell cap thread and spacing configuration and require a separate Flow-Rite manifold SKU. Installing the wrong manifold can result in leaks, improper fill levels, and battery damage. Confirm your exact battery model before ordering.
The BA-120-BLK covers one 8V battery. A typical 48V golf cart or RV bank using six 8V batteries requires six individual manifolds linked by Pro-Fill quick-connect tubing, plus a Flow-Rite fill point/valve assembly and a compatible water source (hand pump, gravity tank, or Flow-Rite automatic pump kit). All components are available separately and interconnect via the same Pro-Fill quick-connect standard. Contact us or browse our Flow-Rite category for complete system components.