Stop guessing at water levels and stop removing caps one at a time. The Flow-Rite Pro-Fill BG-U24V-1K installs directly on your four Crown GC12 6-volt batteries, replacing existing vent caps with automatic shut-off valves interconnected by tubing. One connection, one fill, and every cell stops at exactly the right level -- every time.
Flooded lead-acid batteries like the Crown GC12 require regular watering to maintain capacity and service life. Overfilling washes away electrolyte and damages cells; underfilling exposes plates and accelerates sulfation. Both failures are common when you're removing twelve individual caps, peering into each cell with a flashlight, and trying to hit the right level with a squeeze bottle or funnel.
The Flow-Rite Pro-Fill system eliminates that entire process. Each automatic shut-off valve threads directly into the battery's existing vent cap opening. The valves are linked by a network of small-diameter tubing that routes water from a single fill point -- typically a quick-connect fitting on the end of the tubing run -- through every cell in sequence. When each cell reaches the correct level, its valve closes. Water then flows to the next open cell. When all cells are full, flow stops and you disconnect.
Float-controlled valves stop water flow the instant each cell reaches the correct electrolyte level -- no overflow, no guessing.
Valves are sized and pre-configured for the Crown GC12 6V battery vent pattern. No adapters required for this battery model.
All four batteries water through a single quick-connect port. Hook up a hose or hand pump, fill, and disconnect in minutes.
Pro-Fill valves thread in where your existing vent caps were. No drilling, no permanent modification to the batteries.
A 24V bank built from four 6V Crown GC12 batteries represents a significant investment in house power for an RV or solar storage system. These are deep-cycle flooded cells that depend on consistent electrolyte levels to deliver full rated amp-hour capacity. Flow-Rite's float valve technology ensures every cell in every battery is filled to the same correct level on every maintenance cycle -- a consistency that's nearly impossible to achieve manually across 24 individual cells.
The Pro-Fill valve uses a small float mechanism inside the vent opening. As water enters the cell, the float rises. When the electrolyte reaches the manufacturer-specified level, the float seats against the inlet and shuts off flow completely. The system is gravity- and low-pressure-compatible, designed to work with the hand pump or gravity-feed bottle typically used for battery maintenance. Most installers use a Flow-Rite hand pump or gravity reservoir bottle (sold separately) connected to the quick-connect port to push water through the system.
This kit is configured specifically for four Crown GC12 batteries wired to form a 24V bank (four 6V batteries in a series-parallel arrangement). Verify your battery model and count before ordering -- Crown GC12 valves are not interchangeable with all other 6V golf cart-style batteries, as vent cap thread sizes and opening diameters vary by manufacturer. The tubing routing will need to be planned for your specific battery tray layout; allow adequate tubing length between batteries based on how they are positioned in your compartment.