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Flow-Rite Pro-Fill BG-U48V-6A Universal Battery Watering System for 6x 8V Batteries, 2.5-Inch Cell Spacing

Flow-Rite BG-U48V-6A Pro-Fill Universal Battery Watering System for six 8-volt batteries with 2.5-inch cell spacing, auto shut-off valves and interconnect tubing
Flow-Rite Pro-Fill Universal Battery Watering System For (6) 8V Batteries, 2.5" Cell Spacing
 
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: $146.08
Part Number: BG-U48V-6A
Manufacturer: Flow-Rite

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Flow-RitePro-Fill Universal6x 8V BatteriesBG-U48V-6A Pro-Fill Universal Battery Watering System -- 6 Battery / 8V / 2.5-Inch Cell Spacing

Stop wrestling with individual vent caps and a funnel. The Flow-Rite Pro-Fill system lets you water all six of your 8-volt deep-cycle batteries in a single connection -- each cell fills to exactly the right level and shuts off automatically. No overfilling, no acid spills, no guesswork.

One Connection. All Six Batteries. Done.

Deep-cycle battery banks -- whether in a golf cart, RV house bank, or floor-scrubber -- need regular watering to stay healthy. Doing it cell by cell with a turkey baster or squeeze bottle is slow, messy, and easy to get wrong. Overfill a cell and you push acid out; underfill it and you cook the plates.

The Flow-Rite Pro-Fill BG-U48V-6A eliminates that risk. Automatic shut-off valves thread directly into each cell opening in place of the factory vent caps. Color-coded tubing runs between all valves in a single series circuit. Connect one water supply line, squeeze the trigger (or attach to a Flow-Rite hand pump or de-ionized water tank), and every cell fills to the correct electrolyte level simultaneously -- then stops. The whole bank is done in under a minute.

This kit is sized and tubed specifically for six 8-volt batteries arranged with 2.5-inch center-to-center cell spacing, which is the standard spacing found on most flooded lead-acid 8V golf cart and industrial batteries.

Auto Shut-Off Valves

Float-actuated valve stops flow the instant the cell reaches correct electrolyte level -- overfill is physically impossible.

Single-Point Fill

One inlet port connects the entire battery bank. Fill six batteries and 18 total cells in one continuous operation.

Drop-In Replacement Caps

Valves thread into standard vent cap openings. No drilling, no permanent modification to the battery case.

Pre-Cut Interconnect Tubing

Kit ships with tubing already sized for 2.5-inch cell spacing -- minimal trimming required on most standard battery configurations.

Why Proper Watering Matters

  • Flooded lead-acid batteries lose water through electrolysis during every charge cycle.
  • Plates exposed above the electrolyte level sulfate quickly and lose capacity permanently.
  • Overfilling dilutes electrolyte concentration and causes corrosive overflow during charging.
  • Consistent, correctly leveled watering is the single biggest factor in deep-cycle battery lifespan.

Compatible Battery Types and Configurations

The BG-U48V-6A is designed for flooded (wet cell) lead-acid batteries only -- the type that requires periodic water addition. It is not for use with AGM, gel, or lithium batteries, which are sealed and maintenance-free.

Common applications for a 6-battery 8V bank (48V nominal system):

  • Golf cart battery banks (Club Car, Yamaha, EZGO 48V systems)
  • RV house banks using 8V golf cart cells wired in series
  • Industrial floor scrubbers and scissor lifts with 8V cell strings
  • Solar storage banks using flooded 8V deep-cycle cells

Cell Spacing -- Confirm Before Ordering

This kit is specifically tubed for 2.5-inch cell-to-cell spacing. Cell spacing is measured center-to-center between adjacent vent cap openings on the same battery. Most standard 8V golf cart batteries (Trojan T-875, US Battery US8VGC, Duracell 8V GC, etc.) use this spacing, but measure yours before ordering. Flow-Rite offers kits in other spacings for non-standard configurations.

Maintenance Tips for Long Battery Life

  • Water batteries after a full charge, not before -- charging causes water loss and expansion.
  • Use distilled or de-ionized water only. Tap water minerals accelerate plate damage.
  • Inspect the shut-off valves and tubing connections every 3-6 months for mineral deposits or cracking.
  • Flush the tubing system with distilled water if you notice slow fill rates -- sediment can partially block the float valve.
  • Keep the fill port dust cap in place between fill sessions to prevent debris ingestion.

Kit Contents

Auto Shut-Off Valves18 valves (3 per battery x 6 batteries) -- replace existing vent caps
Interconnect TubingPre-cut lengths sized for 2.5-inch cell spacing, connecting all 18 cells in series
Single Fill Point1 inlet fitting with dust cap for water supply connection
End Plug / Vent1 vented end cap to complete the circuit at the last cell

System Specifications

ManufacturerFlow-Rite Controls
Part NumberBG-U48V-6A
System SKUBG-U48V-6G
SeriesPro-Fill Universal
Battery Quantity6 batteries
Battery Voltage8V per battery (48V nominal bank)
Cells per Battery3 cells (standard 8V configuration)
Total Cells Served18 cells
Cell Spacing2.5 inches (center-to-center, vent cap to vent cap)

Valve Specifications

Valve TypeAutomatic float shut-off, no power required
Vent Cap ThreadStandard flooded battery vent cap thread (fits most US 8V deep-cycle batteries)
Fill MechanismGravity or low-pressure supply (hand pump or gravity tank)
MaterialChemical-resistant polypropylene body, stainless-compatible float
Overfill ProtectionBuilt-in -- valve closes at correct electrolyte level

Compatible Batteries (Common Examples)

TrojanT-875, T-890
US BatteryUS8VGC XC2, US8VGCHC XC2
CrownCR-235, 8CRV220
Duracell / Deka8V GC (golf cart series)
Compatibility NoteConfirm 2.5-inch cell spacing on your specific battery before installing

System Voltage Reference

6 x 8V in Series48V nominal -- common in golf carts and RV solar banks
Charger CompatibilityWorks with any 48V flooded lead-acid charger; water AFTER charging

Important Information -- Read Before Installing

  • Flooded lead-acid batteries only. Do NOT install on AGM, gel, sealed, or lithium batteries. These battery types do not have vent cap openings and do not require watering.
  • Confirm cell spacing before ordering. This kit is tubed for 2.5-inch center-to-center spacing. Using it on batteries with different spacing will result in kinked or overstretched tubing and improper valve seating.
  • Always water after a full charge, not before. Adding water to a discharged battery can cause electrolyte overflow during the subsequent charge cycle.
  • Use distilled or de-ionized water only. Tap water mineral content will shorten battery life and may clog float valves over time.
  • Wear eye and skin protection when working near battery electrolyte. Battery acid causes serious burns. Rinse any spills immediately with water.
  • Supply pressure must be low. The Pro-Fill system is designed for gravity-feed or hand-pump pressure. Do not connect to a pressurized tap or line without a pressure reducer -- excess pressure can force valves open past the correct fill level.
  • This kit does not include a water supply pump, de-ionized water tank, or filler gun. Those are sold separately by Flow-Rite.
Vehicle Make Vehicle Model Vehicle Year Battery Voltage # Of Batteries Battery Make & Model Part Number
EXV2 or EXV4 2003+ 8
U.S. Battery BG-U72V-6A
EXV2 or EXV4 2003+ 8
Trojan BG-U72V-5A
Club Car Precedent 2007+ 8 6 Crown BG-U48V-6A
Club Car Precedent Other 12 4 U.S. Battery BG-U48V-1A
Club Car Precedent Other 12 4 Trojan Plus Series BG-U48V-8J
Club Car DS 2007+ 12 4 U.S. Battery BG-U48V-1A
Club Car Limo 2007+ 8 6 Trojan BG-U48V-5A
Club Car DS 2007+ 12 4 Trojan BG-U48V-1A
Club Car Limo 2007+ 8 6 Crown BG-U48V-6A
Club Car Precedent Other 12 4 Trojan BG-U48V-1A
Club Car DS 2007+ 8 6 Trojan BG-U48V-5A
Club Car DS 2007+ 8 6 U.S. Battery BG-U48V-6A
Club Car Limo 2007+ 8 6 U.S. Battery BG-U48V-6A
Club Car DS 2007+ 8 6 Crown BG-U48V-6A
Club Car Precedent 2007+ 12 4 U.S. Battery BG-U48V-1A
Club Car DS Other 8 6 U.S. Battery BG-U48V-6A
Club Car Precedent 2007+ 12 4 Trojan BG-U48V-1A
Club Car DS Other 8 6 Crown BG-U48V-6A
Club Car Precedent 2007+ 8 6 U.S. Battery BG-U48V-6A
Club Car DS Other 8 6 Trojan BG-U48V-5A
Club Car Precedent 2007+ 8 6 Trojan BG-U48V-5A
Duffy Cat-16 Other 6 8 Trojan BG-Duffy-01
Duffy Cat-16 Other 6 8 U.S. Battery BG-Duffy-01
Duffy Cat-16 Other 6 4 Crown BG-Duffy-01
E-Z-GO RXV 2008+ 12 4 Trojan Plus Series BG-U48V-8J
John Deere Gator Other 6 8 U.S. Battery BG-U48V-1A
John Deere Gator Other 6 8 Trojan BG-U48V-1A
John Deere Gator Other 6 8 Crown BG-U48V-1A
Par Car Eagle Other 6 8 Crown BG-U48V-1A
Par Car Eagle Other 6 8 U.S. Battery BG-U48V-1A
Par Car Eagle Other 6 8 Trojan BG-U48V-1A
Par Car Summit Other 6 8 U.S. Battery BG-U48V-1A
Par Car Summit Other 6 8 Trojan BG-U48V-1A
Par Car Other 6 8 Crown BG-U48V-1A
Polaris Ranger EV Other 12 8 U.S. Battery BG-U96V-1A-2C
Polaris Ranger EV Other 12 8 Trojan BG-U96V-1A-2C
Polaris Ranger EV Other 12 8 Crown BG-U96V-1A-2C
Sanyo Other Other 12 6 Crown BG-U72V-1A
Sanyo Other Other 12 6 Trojan BG-U72V-1A
Sanyo Other Other 12 6 U.S. Battery BG-U72V-1A
Tennant T7 Scrubber Other 6 4 Trojan BG-U24V-1A
Tomberlin Proline Other 8 6 Trojan BG-U48V-5A
Tomberlin Proline Other 8 6 U.S. Battery BG-U48V-6A
Tomberlin Proline Other 8 6 Crown BG-U48V-6A
Tomberlin E-MERGE Other 8 6 Trojan BG-U48V-5A
Tomberlin E-MERGE Other 8 6 U.S. Battery BG-U48V-6A
Tomberlin E-MERGE Other 8 6 Crown BG-U48V-6A
Western Other Other 6
U.S. Battery BG-U42V-3
Western Other Other 6
Trojan BG-U24V-3
Western Other Other 6
Crown BG-U42V-3
Yamaha G19 1996+ 8 6 U.S. Battery BG-U48V-6A
Yamaha G19 1996+ 8 6 Trojan BG-U48V-5A
Yamaha G23 Other 6 8 U.S. Battery BG-U48V-1A
Yamaha G23 Other 6 8 Trojan BG-U48V-1A
Yamaha G23 Other 6 8 Crown BG-U48V-1A
Yamaha Drive 2007+ 12 4 U.S. Battery BG-U48V-1A
Yamaha Drive 2007+ 12 4 Trojan BG-U48V-1A
Zone Other Other 6 8 U.S. Battery BG-U48V-1A
Zone Other Other 6 8 Trojan BG-U48V-1A
Zone Other Other 6 8 Crown BG-U48V-1A

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