Stop removing caps one by one. The Flow-Rite Pro-Fill system lets you water an entire 6-battery, 48V bank in seconds through a single fill point -- and the automatic shut-off valves stop flow the instant each cell reaches the correct level.
If you run a 48V system built from six 8-volt batteries -- common in golf carts, RV house banks, and renewable energy setups -- you know how tedious individual cell watering can be. The Flow-Rite BG-U48V-4G-WS Pro-Fill kit eliminates that chore. Automatic shut-off valves replace your existing vent caps on every cell. Tubing runs between them to create a closed loop. You attach the hand pump to the single fill port, squeeze, and the system fills every connected cell to the precise level simultaneously.
This kit is specifically configured for non-standard battery spacing -- meaning the tubing lengths and routing are designed to accommodate battery trays or enclosures where the batteries are not mounted in a uniform, close-pack arrangement. If your batteries are spread out, staggered, or arranged in an atypical tray, this is the correct variant to select over the standard-spacing version.
Float-actuated valves stop water flow when each cell reaches the correct electrolyte level -- no guessing, no overflow.
Connect the hand pump once and water all 6 batteries simultaneously. Cuts maintenance time from minutes to seconds.
Tubing lengths accommodate atypical battery tray layouts where batteries are spaced farther apart or arranged irregularly.
No need to purchase a separate pump. The included hand pump delivers controlled, low-pressure flow to the system.
Overfilling lead-acid batteries dilutes the electrolyte and causes acid spillage that corrodes terminals, cables, and battery trays. Flow-Rite's float-actuated valves physically block water entry the moment the electrolyte reaches the correct level in each cell -- eliminating the most common source of battery damage during maintenance.
Flow-Rite offers the 48V / 6 x 8V Pro-Fill system in two tubing configurations: standard spacing and non-standard spacing. The BG-U48V-4G-WS is the non-standard spacing version. Choose this kit when:
The Pro-Fill system is designed for flooded (wet cell) lead-acid batteries only. It is not compatible with sealed AGM, gel, or lithium batteries, which do not require water addition. Confirm your 8V batteries are flooded lead-acid before installing this system.
The included hand pump provides controlled, low-pressure delivery ideal for bench-top water jugs or dedicated distilled water containers. For high-volume fleet use, Flow-Rite also offers compatible electric pump and wall-mount delivery systems that connect to the same Pro-Fill valve fittings -- no valve replacement needed if you upgrade later.